It might be more efficient if each person with a concern listed the one thing that they would like to see change and then for some manner of larger list to be created from that.
Speaking for myself personally, I have the most interest in what a Battlegrounds/ PVP would look like with all consumables being off limits. (that useless poison status effect suddenly becomes less useless without green potions around) except maybe for class specific catalysts.
The problem with everyone listing stuff off is, the GMs can only really listen to one person at a time. Right now the community is incredibly quick to point fingers any time any imagined favouritism is shown and it just quickly spirals out of control.
I'm right there with you on the BG/PvP thing and feel that with some changes we could get that aspect of the server much more active. Siege is only 4 hours a week, why cant we give the people who want more, more?
One of the limiting factors with creating PvP/BG content with new rules is that the rules for each particular map is governed by things called maptypes, there's probably around 20-25 of them and each map is given a specific ruleset. This controls things like what skills can be used, what consumables can be used and what gear is usable. You may think 20 is a lot, but when you consider there's one for each of the following: Towns, Inside (buildings), Fields, Dungeons, Quest maps, Siege (x2), Guild Dungeons, BGs, PvP, Instances (one each for ET/Nid/Orc Memorial and SS). It sort of adds up quickly. We cannot just add new ones and have to use existing ones. I believe the current no consumable PvP maptype was taken from the GvG room ruleset. Due to the disabled content there are probably a couple of spares we can use, but it would require some time spent doing the research, making sure that they're not being used and then creating the new rules from scratch (which would require help from the community because we all know how much stuff got missed from the no god/mvp event siege).
Pre-trans pvp could be fun and any changes to BGs that encourage people to actually fight would be great. No consumable rulesets would be nice in certain things assuming we could get it set up correctly, but more for PvP than BGs I think.