So, for Monk...is there any reason not to create a Jab, Tiger Palm macro? Jab if I have enough energy, otherwise Tiger Palm. Tiger Palm is free so I don't see why not.
Jab is a bad use of energy for Brewmasters. It's 40 energy for 1 chi (sometimes 2 if you talent power strikes which you should). Keg Smash is 40 energy for 2 chi, a debuff, and aoe threat. Expel Harm is 40 energy for 1 chi and a heal.
There will be plenty of times that you have enough energy to jab, but you are better off waiting for keg smash or expel harm if they will be up soon. Meanwhile, you should be tiger palming whenever you have a GCD free.
Attaching jab to a tiger palm macro is bad because you there are times you will want to tiger palm without wasting energy on jab.
It's only worth using jab if you are going to energy cap, or if you really need chi *right now* to do something.
In other news, Brewmaster tanking is a blast.
Edit: To be clear, you don't *need* to use tiger palm whenever you have a GCD free. You only need to use it 3 times before every guard, meaning 3 times every 30 seconds (at most). The reason it's encouraged to use it as often as you can fit it in is because it's free damage. May also be able to proc Gift of the Ox orbs but I'm not 100% on that.