Personally, I would like to see salvage being 100% from those that were downed in battle. Add to this, that you get (at least) items from those that you kill that match what you use. IE I kill a sniper, I get their weapon, at least one of them even if I kill them several times.

This would also be an added incentive: if the higher your "Loyalty Standing" the better your chance of getting usable salvage; meaning getting salvage that you can actually use, and not stuff that you can't use because you are not skilled into (or even have the training to possibly use.) I include this, because I have too much salvage that I won't ever use and I have no idea when (or even if) I will be able to give, sell, or trade any of these items that I have in my assets - and CCP doesn't give us any indication when this will come into fruition other than the possible "soon Gäó".

Salvage will never be anywhere near 100%, since that would remove the notion that war has a cost (the very premise of DUST514).

I think CCP has repeatedly confirmed that they want a Player-to-Player Market, but simply refuse to comment on when this would be available. Comments made on IRC, in chats etc all point to CCP wanting there to be a Player-to-Player Market, to the extend that some CCP Developers and Designers have said directly that this is part of their plans.
That you're meanwhile getting salvage you cannot use due to not having specced into them, means that the short-term value of that salvage is low, but long-term it should retain value.

Having loyalty affect your salvage could be interesting, and I'd like to have some influence on what salvage I get, e.g when an item is "destroyed" by me, there could be a 15-30% chance it becomes salvage, and then a 0-25% that it enters my pool, instead of the team-pool. Having the option to set a preference in items (e.g., "I want shield-stuff") could also be interesting, where items from the team-pool is assigned semi-randomly based on preferences, and in order of Standing.