newbie help on live dynamic compression

I’m in no way, shape or form a "pro". I’m simply tasked with taking a not-for-profit/fundraiser, live play and make it sound good. So please, no flames at my obvious ignorance?

The problem (given last year’s experience) is that the various wireless mic’s get shared by different actors in different scenes. Thus, from scene to scene a different person and different placement of the actual mic happens. It makes pre-leveling the incoming mics virtually impossible for anything but (maybe) the first scene.

Thus, not as a solution, but as a crutch, I’m trying to find some dynamic compression software for the levels, in case I can’t reach the mixing board’s (Behringer SX2442FX) faders fast enough and therefore get horrible distortion and/or feedback to start the scene.

I also have the U-Control202, which gives me low-latency stereo in/out to my PC – and I’m thinking of using the aux-sends to bring that out to the PC and back in to the main.

Can someone help me figure out if any of the Breakaway-products are appropriate? Maybe the new "Live" version in beta? If so, does anyone have any tips/tricks/recommendations?

Very much appreciate any ideas, links, etc.

Thanks in advance,
AJ