Due to various limitations that are currently present in the program, it's not very easy to just add number commands to the MPTM format, I think, but I actually don't know how much has to be changed to make it work. And with 0xx to 9xx, we would get another 10 commands, which might not be enough in the future - so instead, focussing on two-letter commands (like Renoise - hint: this is not related to the MPT vs Renoise discussions going on in the general chatter forum) would probably a better thing to do, instead of extending the one letter commands until you need 100 different keys to access them all.