First off, thanks for putting in the effort to suggest things, a lot of people don't.
2x drops have been discussed before, it has a lot of negatives to it. It could easily crash a lot of items. More importantly, if we had lets say double drop weekends no one would PvM during the week. PvM drops are already good, I don't see why people need double, that's just greedy.
Voting was removed, I don't think we're gonna get it back. The facebook-likes system is good enough.
Boss heads for bonus slayer exp is okay, I guess. But let it be only when on a slayer task for that boss, wouldn't want people to farm KBD to 99 slayer.
Coloured robin sets should be from the EP store.
Clue scrolls have been suggested so many times, I wouldn't like them for the fact that there's just so much randomness to them. You could have to kill 1000s of a monster for the clue scroll, then end up walking all around the world, and then you get some crap reward, no thanks.
Corp loot increase? Have you ever tried corp? It drops bloody spirit shields, no need for more drops.
I wouldn't mind new bosses, but for the LOVE of god get in detail about the boss itself. Boss mechanics would be greatly appreciated. And another thing, you forgot battle-mage set in the drops. I wouldn't like the hybrid sets as drops, it'd eventually drop lower and lower until people can get 50 sets of the stuff and hoard it. No thanks.Fire cape is from jad, it should NOT be added to any other boss.
Adding pre-eoc GWD drops is a no. We don't need them. As for sub-robes, we have battle set for that. Gwd is already good enough. While I would like to see nex purely for the fact that it's a good boss fight, it wouldn't be recieved well by the community. It would make a lot of players quit, which is not what we want.
Your effort in these suggestions is nice to see, but it was in the wrong place. Invest more of it in reasons why we need certain things, I don't see much of that here. Why do we need a boss? Why do we need certain drops? This is all important to convince people, yet there's none of it here.
/End