WinImage will indeed work fine for most of the games on 5.25", in those days the copy protection was not that fiendish as on modern CDs.
For some (rare, but there are those @#@#@# ...) you could try
Rawwrite, but I have to say that I never used that one with 5.25" floppies.
On the rare flops that didn't worked with WinImage I used
dd, but that's not really user friendly.
Also keep in mind that probably something as 95% of those games games will work fine by simply copying the files in a folder.
Trial and error .... as always.