It would be very helpful to be able to toggle between inches scale and architectural scale just using a function key ...and doing the switch in one step. I suspect DataCAD is able to do this by is customizable abilities. Perhaps others have already done this?
You can edit your DcadWin.MCR file:
[Letter of your choice used with Alt key]^:^F0^F2^F4
//Changes Scale Type to Inch/Fraction
[Letter of your choice used with Alt key]^:^F0^F2^F1
//Changes Scale Type to Architectural