The problem with a ground that deals damage is that it MUST be THICK. Let me explain the shortcoming(s) of s49judo:
1, if the foot exerts a massive force on the "floor" it will travel below the floor and hence you are stuck.
2, The damage system should be set to 1, 750 frac and 1500 dm, believe it or not, fraqs are unusual, but quite realistic (neck + floor after a throw)
3, The size of the dojo is a problem, is ABD a good size? Most say no, Aikido, Nope again, but in between works quite fine as a single lift is not enough if the thrown opponent knows how to handle the situation.
4, Breakable grabs; Judo is not some "i gave superglue on my fingers" mod, its based on the perception of momentum and balance in relation to force and speed, TB does as of today not handle this, but it has been suggested.
5, Timed DQ, Ippon =/= timed DQ, it would be more realistic to either make it aikido like with instant DQ or to have no DQ at all; Judo is about joint pinning, not ground pinning. Instead of DQ a Fraq = win should work, but as far as i know, this is not yet implemented within the game.