I would certainly play this. Although i don't think it's necessary to add power ups due to it detracting from the fun of the teamplay. It's such a well designed game that flags are generally well fought for, covered, dropped, picked up struggled back to base. A shield belt or amp would just add an advantage that would unbalance the game. Maybe i'm wrong, haven't played with powerups since like 2007. i can see that it would add a talking point for streamers and tactical depth with timings etc that could make for better viewing.
My only issue, which i don't think many people agree with, is that newnet in SA doesn't work properly. Personally (not suggesting it) i would rather play on an American server with ZP. SA was all about the pace, accuracy and the 'snap', it's lost that a little and seems more pot luck now.. I'm pretty convinced of this, i did play nothing but SA from 2002 till 2011. Ran popular servers and leagues, played more pugs in UGN than anyone else by a country mile.
All that aside, i'd love to play this 'mod' in a tournament, if you guys/gals would put the thing together i'd be most pleased!