T3 Backward compatibility

Hello.

I see that several T3 templates supports the version 3.0 of Bootstrap, I wonder how you guys are doing to ensure backward compatibility for all those extensions at the Joomla! extensions directory that built on bootstrap 2.3.2 which is the official version supported by Joomla! so far.

Are you guys also supporting BS 2.3.2 markup and classes on all your BS 3.0 templates or simply not.