As far as spaying while in heat, I know that some vets don't do it, but getting her in between heats can be tricky
As far as the claw thing, I have a Siamese that has the claw sticking out thing, and unfortunately he's an adult that never got used to having his claws trimmed so its a nightmare to do it now, I try to get one or two whenever i can, but if you get your kitten used to it while she's young it will be easy in the future and trimming the claws does do wonders for how much they can actually scratch
As far as the claw thing, I have a Siamese that has the claw sticking out thing, and unfortunately he's an adult that never got used to having his claws trimmed so its a nightmare to do it now, I try to get one or two whenever i can, but if you get your kitten used to it while she's young it will be easy in the future and trimming the claws does do wonders for how much they can actually scratch