The only real way to do that is if NTA or someone else makes the game show in the log that last stand was used. As of right now, last stand does not show up in the game log or any other way, so there is no sure way of detecting it.
I would advise asking at the aiw forums if it can be coded in, or if there is some mod that you could run that logs it. Once it starts getting logged, then you could use the antinoob plugin or write a new one to kick/warn for it.
ok thanks for telling me that