Don, I would expect most OS aware software to support RTG modes. Personally, I prefer to open applications on the Workbench screen using a nice large resolution, rather than having separate screens for each program.
I'm afraid I have never tried the Catweasal, however support for this hardware appears to very good in WinUAE for quite some time.
Regarding the 68060.library, again, I'm afraid I do not have any experience with Amiga software that requires an 060 to run. Indeed, it is debatable whether a 68060 optimised application will function any faster with WinUAE than a vanilla 68000/68020 task.
Kind regards,
James
x
ps. Very stylish website, lovely job!