Yes, I am using the new version of the extension, and GMS1 v1.4.9999.
So, if everything's fine on your end, as well as the person who requested the change, then there must be something I need to address on my part, to make my controller code work while the extension is active.
I'll do my best to discover what that is, as well as dig more into how the extension's example handles inputs. The example was a very helpful reference, alongside the docs, in getting the most out of it!
In any case, thank you for your time and confirmation that nothing suddenly broke. You're an outstanding developer, YAL, you do so much for us Game Maker users!