Dude! Such a fantastic idea for both scenarios.
I hate the Valus fight because its so long to get to him, and then him along is really long because he such a bullet sponge, and the Phalanx's are such a pain especially in the higher level versions. But being able to use his gun would be badass, and since you can't walk around with it, you will be forced to run when he's ready to pick it up again!
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Yeah, I figured that at the end of the "overheated" stage, Val's helm would slam shut with an audible *clink!* just moments before he rocket jumps to his gun, landing with an explosive impact (similar to the boss in the mars mission where you charge the gate lord's eye) that would kill the guardian using the gun if he failed to move out of the way.