Changes since 2.11:
rebuilt with latest Forge to fix loading issues;
added automatic disabling when ran on the server (so it doesn't crash).
This is the second 1.14.4 release, and it's a beta release, which means that it might have bugs, so please report them to the issue tracker.
The way input works has been completely reworked to match the new 1.13 Minecraft and Forge input model. It's much better than the way it used to work before 1.13, and will hopefully solve any remaining input compatibility issues. That said, the current initial implementation might very well have issues, and I haven't really tested this with mods yet, so please do so and report any issues you find.
Also the configuration GUI hasn't been ported yet, that will come in the future. Please use the usual config file for now. Note that it doesn't currently generate on first mod launch (known issue), so here's the default config file (.minecraft/config/MouseTweaks.cfg):