There's currently no way to change this besides messing with the sources.
Maybe somewhen the mouse movement/buttons will be included in the
mapper so they can be arbitrarily changed.

there is hacked version of ctmouse.exe that deals with this problem. i'll try to look for it. i don't know if it will work with dosbox though.

I tried to add it to D.O.G by hooking into the Mouse LowLevel System Hook of Windows, and it worked as long as it wasn't DirectX or OpenGL that was rendering.

So the only two options I geuss there are left are rewriting a plugin dll for SDL or rewriting DosBox.

I think a good solution would only be inside DOSBox, because
a) portability - go with your game config to any computer and it will work
b) it's probably not so good tampering with your Windows drivers. It may work on a Windows XP, but not on Vista, etc.

If anybody of you DOSBox guys could do that, it'll be perfect. I'd like to help, but I'm not a programmer. 🙁

It won't be any time soon, sorry.

here it is: ctmouse v2.1b4 including binaries with inverted axis.

Thanks a lot! Tested it with Last Rites - works great! 😀

Sheriff Hobbes: I today found this game, and I also used ctmouseY.exe to invert the mouse axis in game, after that I hit Ctrl F5 to take some screens, and the game noticed me to changed mouse axis by itself without the tool...so F5 is simply changes axis in the game... 😁

pycur wrote on 2019-08-09, 09:50:

Sheriff Hobbes: I today found this game, and I also used ctmouseY.exe to invert the mouse axis in game, after that I hit Ctrl F5 to take some screens, and the game noticed me to changed mouse axis by itself without the tool...so F5 is simply changes axis in the game... 😁

Pardon the necro. Doesn't work for me. I thought the button F5 can toggle normal/inverted mouse axis as you described, but I press the button, and nothing happens. Once I load ctmouseY.exe, the Y axis stays inverted regardless.