Some of the input issues are due to OS shortcut clashes, which then cause issues with Wine. This means it has difficulty in realising the true status of a key (sometimes the ‘stuck’ issue being reported).
Other issues are just due to the OS / Wine / Game layers that get crossed - if any of them has an issue, it gives a poor experience. I’ve noticed this in particular when the system is under heavy load.
We’ve been doing a bit of a dive into input the last few days, including rewriting some core bits of it (like default shortcuts).
When we have a public test, I’ll be keen to hear comments about input / shortcuts, as I know there has been weirdness with the Wine client.