Latest TinyMCE support?

[SuperMindConsulting]

I was trying to make the TinyMCE-based HTML editor a little more user friendly for content authors.

I would like to take advantage of the following improvements for verison 4.X of TinyMCE.
1) New Plugin called importcss. It basically traversed the supplied CSS files and populates the FORMAT doprdown with Class Names from the supplied CSS file(s).
2) better HTML5 support

As of R9, AC used version 3.4.9 (released back in 2012)

Has anyone tested newer 4.X releases of TinyMCE? I realize the HTMLEditor is a CommerceBuilder webcontrol, but the TinyMCE script files are in the WAP.

Before I get my start tinkering, I thought I would ask...