Check LEAP against known Rages?

Would it be possible to disable or enable the Leap command (still on Veldt) based on known or unknown Rages?

I was always fond of having Leap replace Rage while on the Veldt, using only one commamd slot, allowing Gau to have the standard Fight command as well.

What I haven't done is ever attempted a check against known Rages in order to enable Leap to replace Rage. Never checked against known Rages or known spells/skills for anything for that matter...

Not even sure if the vanilla game EVER checks anything against known spells/skills/rages at all, to use as an example. Pretty sure checks against current enemies is done, but is it ever in comparison to known Rages?