Ugh. Scrap Pepper, bring on Bethany.
But honestly, if Pepper were to become rescue, I'd want it to be in a later movie. I think piloting the suit to bring it to Tony--as suggested--giving her a chance to kick some tail, would be awesome.
I always thought Rescue was a good idea as character development for Tony Stark more than Pepper. Poets write poems for those they love, painters paint their significant others, so Tony makes his girl an armor. I always thought Pepper should get in the suit once in a while, but typically not like fighting stuff.
And Coulson as the voice in the Rescue armor? Sick awesome. If I didn't already have another idea for who I wanted in the armor...