How about implementing a "new" (as far as I know) rule in MMA matches that a fighter can not be saved by the bell/horn if caught in a submission. I'm not talking about just a controlling position such as mount or having someone on your back, but deep in a triangle or kimura keylock where a sub seems very likely.
In my experience, I've seen many matches that would've ended in a submission if the bell didn't end the round, so i proposed to ICON today that they take a look at intergrating this rule into their fights. The ref could yell at both fighters if in the last 10 seconds of a round, "SUB ON!" or something like that, notifying the fighters, corners, judges, and fans that the bell will not end the round unless there is a tap out, the "sub-er" (as opposed to "sub-ee") gives up the hold, or the "sub-ee" legitimately escapes (rather than hanging on for the bell).
I'm sure this has probably been discussed here before, but I haven't seen anything lately and would like some honest opinions on this.