Let custom ROM "customize" after hard reset if I'm already on Sprint 3.35?

[theTastyCat]

Hi all - thanks so much for all the work that's gone into this stuff. I've searched, but can't find this answer.

I know (from bitter experience) that it's a mortal sin to allow the Sprint customizations to run when upgrading a Verizon phone to Sprint 3.35. My question is after I flash a custom ROM (such as no2chem's kitchen), should I allow the "customization" to happen or would that bring me back to Sprint purgatory?

Thanks,

Gerry