Get this straight folks, there WILL NOT BE any Paul-Romney or Romney-Paul ticket! EVER! Same with a Paul endorsement of Romney in exchange for some other position, or a position for Rand, or anything. Not going to happen! EVER! You're worrying and arguing about a hypothetical scenario that has ZERO probability of actually occurring.
It bothers me that folks would even conceive of the possibility that Paul would accept something like this. He wouldn't, and he won't. It's the white house or bust. I am 100% certain that Paul will not endorse or join with any other GOP candidate if he's not the nominee, and I'm 100% certain that if Paul is the nominee he will not choose his running mate from among the other GOP candidates - the only exception being if there's a brokered convention where he has no choice but to accept one of them in order to get the nomination, but not the other around (i.e. Paul will not give his support to another nominee in exchange for a VP slot for himself).