Hello! Thank you for your kind words. To answer your questions:
1) Yes this code should be compatible with any of the tools I've released, although those tools are not created with the controller support expansion in mind so you may need to adjust them with the included features to be more controller-friendly.
2) Oh, the timeline here is definitely months to possibly a year or two for some of the changes. The reason I'm releasing this as an add on is because it's likely to take a long time to properly see several of these changes in the engine, and I want people to have access to these features now. What I meant by getting the changes into the engine is that I personally write a pull request with updates and ask for it to be merged into the engine. The reason this will take much more time than a few days is that some of the features are something of a "band-aid" for fundamental issues Ren'Py has with focus. Fixing the engine requires ripping up and redoing these features from the ground up to work better for controller users rather than patching fixes on top of it.
3) The tool is ready to be used now! I've tested what I can to make sure it's bug free, but there are so many features and ways people may use them that I haven't anticipated, so it's very possible there are things I haven't accounted for. If you find a use case the expansion doesn't cover, or issues with the tools, let me know! Let me know also if there's a feature you could use more explanation on in the documentation. It's a big collection of features and I will be supporting it to the best of my ability.