There are a lot of sample configs out there if you Google for them. They will pretty much all break cPanel, though, so don't do it unless you're willing to handle all your Apache and PHP builds manually from now on.
Actually, this is untrue. cPanel happens to be quite flexible with most "dual-version" implementations.
Unless you select to reset your httpd.conf, it will not be, and the /usr/local/php5 directory (that is commonly used which such installed) is uninfluenced by PHP compiles through easyapache.
Do you have an example of this being done with suexec support on both versions? I've never tried it, I'm just not sure how one would get very far without modifying httpd.conf.
Minor modifications are necessary to httpd.conf. But, who cares? cPanel doesn't overwrite that *ever* unless you specifically select for it to do so when running easyapache.