You can't stop it from happening; you can only use DialCleaner to fix it afterward.

Poser wasn't coded to hide those kind of dials, but if you stick a hide command in the right place in the CR2, they'll be hidden anyway. DAZ is utilizing a file hack that Poser can't do on its own; when you resave the character, the hide lines don't get written. Hence, a utility to do it for you.

Maybe it's been addressed in Poser 6 ... if not, you can start pestering CL to add this function through a service release or in Poser 7. I don't think it'd be that difficult to code, personally.