Blitz2, Swdtech2, Morph2, etc...

The code governing whether or not a command is available is at C2/53C9. It's actually not part of the Leap code; the same code governs the availability of Magic, X-Magic, Morph, Dance, Leap, and Lore. (Lore is never actually checked, as Strago knows three Lores at startup, but the code is in the game to make it unavailable if no Lores are known.) You could theoretically co-opt the Lore check for whichever command (Tools, or whatever) you want to make available only at certain times, leaving Leap intact, or you could make use of the Leap check itself. Since the code that governs availability doesn't have anything to do with what the command does, it's a simple matter to alter the command you're dealing with -- just point the relevant code to your new command, instead.

I haven't dealt much with Leap/Rage yet, since I'm not using them in my hack, so while a quick glance shows that Leap's availability is governed by a bit in $11E4, I don't know much about how it's set; it looks like it's set in C0 from the formation data, maybe?