back when TDs were two points, I used to think reversals should be worth three (It's like getting an escape AND a takedown!), but now I actually think the scoring is in really good shape with 3td 1e and 2r. If you reverse and let the guy go, that's kind of like getting an escape. If you reverse the guy and hold him down, that's slightly better than an escape (and you can accrue riding time, could be a three point swing!).
I wonder if making reversals higher in value would decrease their frequency. Like if you would get three for a reversal, the top man would be more likely just to disengage with a possible scramble rather than try to maintain control.