A little doctrine to poke your eyes out with:
In a CAS scenario, a JTAC can control exactly how and what type of ordinance is used for each attack (Type 1/2 control). For this type he'll control each individual attack with the term "cleared hot". For type 3, he'll use the term "cleared to engage" which may include restrictions including what ordinance to use.
But...a JTAC is not required to employ ordinance in all situations.
1. Air interdiction tasking - A designated authority, such as an AOC/ASOC can task an A-10 to "target" an objective. The pilot may release ordinance if:
-The CDE has been met and is in accordance with the GFC directive
-A PID has been established that the target is hostile
Both must hold true for the duration of the attack
2. JFACC tasking - The big man says drop the bomb, the above restrictions may or may not have been met. Drop the bomb.
3. Self Defense - Never restricted. However, must be proportionate to the threat (the common saying is you can't drop a nuke on a guy with an AK-47). May be used in the defense of self, or friendly/civilian forces on the ground.
4. ECAS - There's also emergency CAS with non-JTAC qualified personnel. All in the JFIRE.
AINT is kinda sorta in this sim but there's not a FLOT and FSCL established to differentiate between INT and CAS. No aircraft is going to be given a blanket authority to just "go out there and F S up". It's almost always going to be "mother, may I?".
As far as which weapons is employed...Eddie is correct, there is no book telling you to use weapon X in situation Y. There is a book that says you could use weapon X against target Y.
In the real world, the SPINS will dictate a Standard Conventional Loadout for each aircraft that will be employed in theatre. This will be determined based on the perceived threats and targets of the battlefield. By no means set in stone but it gives the GFC a good idea if he calls an asset (A-10) for support he has a good idea what it's capable of.