more bg and more time for arena

[R261816601]

i'm not the only that think arena and bg are too fews.

often but really often i've 1 attemp to arena after arena end in afternoon and i must end in evening. put more time plz.

and in afternoon when i end mine runs i would do bg but i must wait the evening.

[Arlad]

more time for group arena could be bad because it would create more matching issues.
as for BG, we already have 8 BGs a day...