Have already discussed it. It won't work coz they still remain interruptable.
So, we stopped at:
1. Commandos need RANGE root. (concusive charge would be also nice (gs/sniper analogue)
2. Instant casts of charged bolt/grav round
3. RS upgrade (immunity to CC/snare for some seconds)
I believe commandos/mercs have future. We don't need NEW abilities but some additional utility to what we already have.
or maybe you should just stop playing poorly.