I have to agree with those who've complained about particle spam in groups with large numbers of auras, and radiances, and just plain large-area glowy stuff. I've played in PUGs where I literally couldn't see anything but the power effects and the occasional team member or enemy, where I had to use the map to follow the team instead of just following the person in front of me. If you had the option to dial that down to a thin mist instead of an all-encompassing fog that would be great.
As far as anything else, the only thing that currently comes to mind is an old request of mine -- a hockey stick option (field and ice) for War Mace.