[that_guy_iain]

Realistically, if you need custom features to your linux distro, you wouldn't be paying for Red Hat, the moment you modify something your system becomes unsupportable and not in compliance and a whole bunch of other things that are the reason you pay for RHEL.

If you're at the level of needing custom operating system modifications you're probably better suited to finding a distro you can fork. Not pay for RHEL.