I don't have a problem with legging, but maybe I just haven't faced a legging master or something. That said, I think being able to MOVE after having leg blown off is ludicrous. MAYBE be able to stand, although I like the propping/sitting up idea far more. If you are able to stand, it could be graphically represented by the leg breaking off but not falling, propping your mech up. This would NOT allow turning at the hips, as an attempt to do so should break the leg off and cause a fall.
Either way, I think it's fine the way it is now, so the smaller the change the better IMO. (For the record, I have only intentionally legged a mech once, and that's because he was standing still, 1000m away. Wanted to see how effective the Partisan Prime is at that range.. a bit too much was the answer)