(Bad english Alert!) Survival arena with scoreboard in complect. Its pretty simple idea that can bring many hours of addictive gameplay. Also, it will be cool if it will be special outfit & weapons for that arena(s) that will have no UVs or other unbalanced stuff (clean 5* cobalt set?)... Arena(s) can be add to Krogmo Coliseum as variant. So, u must just fight waves of monsters (maybe it will have special indicator for waves) & it will be harder from wave to wave. Every 10 waves it can be Boss Wave.
http://en.wikipedia.org/wiki/Survival_mode
Maybe it will be great if every 10 waves it will be some kind of Prize, so ppl will hunt for it, & forget that they will "loose" (but they will not, cause its Survival Mode ...)
"maybe it was suggested before, but i dont care"
Then neither do I.