I've no doubt heating/curing them in a controlled manner(ie off car) has some effect, we do it to loads of different materials to alter properties but:
- on car isn't controlled, different areas would be brought up to different temps at different rates and each tyre would be different again.
- even in a controlled manner, how big a difference? like adding nitrogen instead of air? I bet one clumsy lead foot session would negate any life expectancy gains from your controlled scrub.
So, worth the effort/cost, I doubt it. Your driving style/skill will have a bigger difference and the money you save in not paying for the scrub service you can put aside to lessen next purchase cost.