Respect. Altho many have been suggested before, you had good ideas and you kept it simple and doable.
Hopefully that helps.

You got your first like from me. Keep it up. More ideas.

Game modes have to make sense in the context of an actual war in the game's universe. This game does lack game modes, but simply copy/pasting CoD game modes is not the answer.

Sabotage/Demolition: We use to have a game mode kind of like these, it was the original Skirmish mode before they changed it. Attackers have to destroy 2 defense relays that controlled the defender's installations, then once those were down, the attacker had to move forward to the outpost to disable to the anti-MCC cannons so their MCC could dock with the outpost; basically one stage demolition, the second stage is sabotage. The good news is that the old Skirmish mode will eventually come back as a new mode.

Capture the flag: We are mercenaries hired by different factions and corporations to fight over territory, there is no reason why we would be hired to capture a bunch of flags. Does not make sense in the game's setting.

Kill confirmed: No one would hire mercenaries to collect a bunch of dog tags (which we don't carry).

Last man standing: Doesn't make sense why we would be limited to one life when our minds just upload into new cloned bodies when we die.

Ground war: I would love a large scale battle, but CCP is still struggling with having 32 player battles without frame rate problems.

All your time suggestions are really shorts, I would much rather longer battles that last like 30 minutes.

How about instead of capture the flag, a game mode called VIP.

The game mode takes place in smaller, mostly indoors maps. One member of the defending team is marked as a VIP. This VIP does not respawn, has a unique skin, and only has a scrambler pistol plus flux/locus grenades (perhaps a stealth module as well once those are implemented). The other team is tasked with killing the VIP while the other team has to keep the VIP alive and either deplete the enemy's clone reserves or last until the time runs out. Best two out of three wins the game.

This would make sense lore wise assuming only dust mercs and eve pilots have the immortal clone capability and with a bit of roleplaying that the VIP is not a merc. Is everyone in New Eden immortal or is it just the mercs and pilots?

Capture the flag: We are mercenaries hired by different factions and corporations to fight over territory, there is no reason why we would be hired to capture a bunch of flags. Does not make sense in the game's setting.

Wouldn't necessarily have to be a 'flag'. In Team Fortress 2 you fight over a briefcase. In Dust we could be fighting over some item that both sides want... How do you feel about hiring a bunch of mercs to fetch some officer weapons?.

So basically Call of Duty game modes? That's what you're saying.

Sabotage and Demolition kinda sounds like it's the exact same gamemode. Scratch both of them. I would rather see some kind of objective mode where 1 team has to accomplish objectives (Open a door, install a cannon, stuff like that) and the other team has to prevent it. After every objective the defenders lose some spawnpoints and have to fall back to the next objective. (I never played Skirmish 1.0 but I read a desription. It basically was this, wasn't it?)

It was already said that Capture the flag, Kill confirmed and Last Man Standing don't really make sense. Ground War? Why? This would just be the same as the normal modes just with more players.

Also you seem to forget that more modes means less players on every mode. And we only have about 7000 online at the same time at most so far. I also think this is the reason why they even decided to only give us one skirmish mode at the moment instead of 2, resulting in the removal of Skirmish 1.0.