Two questions:

You're a gestalt Barbarian//Rogue. By when do you recieve Improved Uncanny Dodge (Uncanny Dodge specifies it stacks with itself)?

You're a gestalt Rogue//Scout. You take that one feat in Complete Scoundrel which allows your Rogue levels to count as Scout levels for Skirmish. Does your skirmish actually go up, or is it only if, say, you swap over to taking Rogue//Fighter levels that it makes any difference?