Zhydaris:
"1 - The Banelings cannot detonate while burrowed, they have to unburrow first and then explode.
I know what you’re thinking. “Hey, probably exploding while burrowed would be a better warfare tactic”. You must understand that exploding in the name of the Zerg is indeed a great satisfaction for a Baneling, thus they prefer to unburrow in order to showcase their enthusiasm for their role by exploding with a smirk on their face. If you zoom close enough you will see a little smile on their little glowing face of theirs. Ah, gotta love the Banelings.
2 – They’ll wait for your command. If you don’t tell them to explode, they’ll just wait while staying burrowed. That’s nice for setting up ambushes.
3 - They always wait for your command.
4 – They’ll not behave like Infested Terrans. The attack-move command is not going to be interpreted as “Go and explode at this location”, but rather as “Move to this location and attack any enemy unit. If you can’t spot an enemy unit, just sit there”.
5 – It’s comparable to a D8 Charge, yes, the explosion covers pretty much the same area. "