Installing Fusion 4 and 5

Hi all folks,
after migrating to Fusion 5 I find some games and graphic tools are not supported by Fusion 5.
It seems to me Fusion 5 does not support OpenGL and DirectX in a adequate way today, but Fusion 4 and 3 do.

Any way to install Fusion 5 and Fusion 4 on the same system, I'm not interested in using both concurrent.

Any suggestion, any experience?
Thanks for ay help,

Lutz

p.s.

I know

Downgrading from Fusion 5.x to Fusion 4.x (2036104), http://kb.vmware.com/kb/2036104
and

Reverting to VM Ware Fusion version 4.0, http://communities.vmware.com/thread/441240