Is there some way to import the settings of an OpenVPN client into the built-in VPN client in Mountain Lion? Or am I comparing apples to oranges?
As of today, OS X does not support OpenVPN in the built-in "Network Manager".
Out-of-the-box OS X only supports:
However, you can use the following third-party OpenVPN clients in OS X:
I can confirm that both Shimo and Viscosity support the import of