Okay, I've got this idea for a game mechanic.
The default battle engine's escape is kinda crappy, so I've decided to modify it a little:
when you select the
Escape command, a time bar makes her appearance:

Pressing Right and Left arrows alternately, you'll fill the escape bar.

In order to escape, you have to fill the bar before the time runs out.
Time is calculated on the enemies total
speed parameter: the more the enemies are quick, the less time you have.
If enemies are present in a large number, time is even less than before.
Again, if there are too many enemies, you won't be allowed to escape, unless you kill some of them.
I'd be glad to have some feedback on this idea...
Jens