Mmm, I guess you are not making friends with this question in a Mendix forum :). If you don't like the html Mendix generates, well don't use Mendix. If you need special kind of html for certain purposes within a Mendix project write a custom widget that creates the html for you. There is templating available which allows you do anything you want.
Yes it's possible.
But indeed, why would you do that? ;-)