Ciao!
For RRs, basically it's up to the GM. If you feel a particular creature should be resistant to a certain kind of attack, just inform the players and give it a racial RR bonus.
For BARs, IMO, if a creature knows a list up to a certain level, it means the monster has an equal number of ranks in the list, that are added to its Basic Attack Rolls. If a creature simply "knows" a list, it knows all spells the list contains, which means it has 50 ranks in it (dragons are scary...)!
Also, note that normally monsters need no maneuver to cast their spells, they just need to expend their PPs/daily usage of the spell.