1) Gralats dropping on death - The problem with this is that gralats relate to actual money now. Even though you can farm gralats like the good ol' days, you can also buy gralat packs. That means if they die enough then they could lose actual money they spent on the game. Bombs and Arrows maybe, but I like the idea of spending money to replenish them, especially since you have such huge caches.
2) More hearts/sword power - These are being considered. No point in shields though as everyone gets a speed boost now I'm pretty sure.
3) Events - I'm kind of 'meh' at the idea of events. They seem to take over servers and all focus goes to events because they're content that can be played over and over. Next thing you know players are demanding them 24/7 and that's all they care about.
4) Playerlist - Unfeasible/unpractical with such a large playercount.
5) Deaths - probably not displayed to encourage players to partake in PvP. I'm not bothered as it means less players care that if they die they'll have a +1 on their stats and generally means they're more likely to enjoy PKing since there's really no downside to dying. At least now with no loss of gralats/death count players can enjoy PKing without worrying about dying.
6) Trading - controversial subject and staff are well aware of its suggestions.
7) Staff list - Having an open list I feel would just get staff spammed. There should be a "I need help" button or something that isn't as serious as filing a report, but relays your concern to all staff(probably GP only) and whoever is available could come help you. This would need to be moderated like report though, so it's not abused/spammed.