you can't do a lot of the parkour style legs through your arms vaults cause your legs are 18 inches longer, but you can do side vaults over very high railings which is fun.
As for high drops that's up to you, your equipment, and your ability. I've seen some pretty high drops 6ft+, at that point your almost guaranteed to bottom out the springs but you can absorb the impact with your knees if your expecting it.