Godot daily builds are, for the most part, fairly stable. I would always keep a backup and use source control just in case, but it should probably be okay for the most part. I wouldn't recommend starting a multi-month long project with a daily build, but especially for prototyping it shouldn't be too much of an issue.
The fix should be in the dailies, since the PR containing the fix was pulled in around May 4th (first PR) and May 28th (second PR). Unfortunately, I do not have an Android device, nor an Android gamepad, so I cannot say for sure whether it has been fixed or not.
If it does fix the issue, then it might be cherry picked for Godot 3.2, which would mean the wait to get an official Godot build with the fix would be much shorter.
Though if the issue is still present in the daily builds, I would highly recommend opening a issue on GitHub, after checking to make sure none for the issue are already open, so it can be hopefully be fixed in the future.