Mechanic and ranged alacrity

[Tlorrd]

Couple of Mechanic questons ...

T5 30% alacrity does not show up in the character box sheet ... is it an enhancement bonus?. Do items with enhancement bonuses stack with this? Haste boost seems to stack. Does Haste and Haste boost both stack with this? Does increased BAB also increase your ranged alacrity such as casting Tensor's to get full BAB?

Sorry for noob questions, been a while since I play mechanic. Was my first real toon I leveled to 20 many years ago and haven't been back to it since. Unfortunately I think I got rid of the old school disrupting, banishing, smiting repeating xbows.

Also does enhancements from bolts (if different than your xbow enhancement) stack? Tooltip says no ... but you know how those can be.