Low level tanking.?

That's a nice macro, but be careful not to spam it too much if you're rage starved, as Maul is off the Global Cooldown and Mangle is not (you can actually use both abilities at the same time)
You probably don't want to end up wasting the last bits of rage that you have on Maul instead of Mangle, unless you really want to hit two targets (in case you have Maul glyphed), generally it's better to prioritize Mangle over most other attacks as long as it's off cooldown.