This is an interesting idea, one which I'm not necessarily against. But I suppose it moreover comes down to the question of whether or not Shield and Armor Repair-Tools should be separate equipment. But given how Dust is built around the idea of squad-dependence, and given how 1.8's suit changes seem to be pushing most roles back towards this idea, I'm leaning more towards them being separate equipment (since that promotes even more diversity and role-specialization). Anyway, in terms of your idea, I would recommend having the standard rep-tool only able to heal either armor or shields, not both at once. But then offer variants that can simultaneously heal both at a reduced rate, and/or with some other penalty.

Also, your title might just be a little misleading, FYI.

+1, its just useless as shields have next to no HP when compared to armor

Thanks for the feedback Summ.

The only problem with having them as separate equipment is going to be the whining of many players saying they can't be a great support logi because I have to carry two rep tools and can't fit my hives/ scanner/ injector etc. I do like your idea about having variants though. It would offer more diversity to the game.

Nice idea but I think repping on Shields should be slightly less efficient (90%) than armor as generally Shields have less hp than armor.
Alternatively, as Shields are energy, it could also be so the shield repair instantly reps Shields, but requires a 5 -10 second (varys depending on how much shield it just repaired) recharge time after repping.

The efficiency penalty is actually a great idea, just I don't think I would go as far 90%, I think it would be nice at 70-80%. Mostly because you still want it to be a little viable.

As for your alternative, I don't think so. I think with that idea, it would be confusing for CCP to explain exactly how it works and for player to learn how to use it. In my way, it would be simple because it works exactly like the normal rep tool just using one more button as a secondary function.

Can't support. DUST needs to be as much like EVE as possible to be successful, and to that end, shield reps need to be a different piece of equipment from armor reps.

I'm not necessarily disagreeing with you about having two separate rep-tools. But why does Dust need to be as much like Eve as possible to be successful?

Now before you start yelling "Why would you ever equip two rep tools?", let me explain.

With the new Logistics bonuses most likely coming in 1.8, the Min Logi sort of gets jibbed with the bonus to its equipment: the Repair Tool. So I think to compensate for this crappy bonus, the repair tool should be able to repair both armor OR/ AND shield.
Since the repair tool doesn't have/need an Aim Down Sight, I was think of having the L1 button repair shield. That's pretty much it.
Now before you start complaining on how heavies and people with a Logi repping them with both R1 and L1 pressed will be invincible, let me explain a LITTLE further.
The Tool will have the intended repair/recharge rate if used solely on armor or shields. But when both are pressed, the repair/recharge rate is split in half and another stream would come out in a different color. So even with a proto Min Logi and a core repair tool would not be able to keep another player at full health during an intense firefight.

Here's an example on how useful it would be:

You are a Logi with the dual repair tool and have a Caldari Assault who just finished killing a red, but not with out eating up his shields. You scan and notice there is another red dot coming towards. Knowing that caldari is shield based and his armor isn't that high you go to rep him with the tool. Instead of repping his armor, which will do him no good because they aren't that much and weren't depleted, you shield recharge him using L1. Now he is ready to take on that second red dot.

So guys and gals, tell me what you guys think about this.
Should it be implemented?

Yes we most certainly should have a shield repair / shield energy transfer tool.

To the people saying it would be over powered, no it would not be. It does not matter if you transfer to shield or armour - the friendly target will recieve a certain amount of HP every second, regardless. It makes no difference if it goes to the shield hp pool or the armour hp pool does it.

Besides the Caldari heavy will be at a great loss without a shield repair tool. Also guys we used to have shield repair tools, they were called shield logi LAV`s. Not many people used them but I did and while it was great, it was not overpowered in any sense.

Balance is really not an argument in this.
Variety, however, is. Don't make shields more like armor. Make them more like shields.
A simple shield repper is a no-go. It has to work differently from the armor repper.