Microsoft remote desktop Mac keyboard not working

I sometimes have to use Microsoft Remote Desktop Connection for Mac for remote access to a Windows 7 machine from an iMac running MacOS X 10.6.6 [Snow Leopard].

Making the mental switch to use the Control key CTRL in place of the Command key CMD while in the Remote Desktop window [e.g. CTRL-C to copy instead of CMD-C] is a pain and a source of constant errors.

I would like to be able to map the CMD key to output a CTRL key on my Mac, but only when accessing the Microsoft Remote Desktop Connection for Mac application. Remote Desktop Connection lets you map a number of other keys via its Preferences . . . but not the CMD key.

I.e. in any other Mac application, CMD would act like CMD. However, in Microsoft Remote Desktop Connection for Mac, CMD would act like CTRL.