Maybe this is ridiculous, but a one click "Every fighter challenge all" button. Currently I can click a fighter, then click fight, then click Challenge all, repeat 20 times. Seems like it's not a big deal until you're crunched for time or you're trying to do it from your cell phone. Or I can click one button on the Team page and be done. If you're too busy, log in, click the button and BAM!!!!!...instant increased "activity" for all to benefit from.