How 'bout spellcasting while being stunned?
Reading "and the only other actions allowed are movement and maneuvers, both modified by at least -50"
Looks like you can't but there are spells that relief oneself of stuns, like monk's "Stun Relief I (HS*)".
We houseruled that you can cast NONE attack spells, like "Stun Relief" or "Leaving", "Invisibility", "Fly".......
Did we houseruled wrong?