As of 1.0.9, I can't get mouse to cross windows, but I can move window
items with the mouse.
Someone in the forum said that the version after 1.0.9 has the fix for
this I saw in github.

I wanted to ask if you are working on an update right now? Is it
possible to work on an update with the pinsyscall stuff happening until
it settles down?

In any case, thank you for bringing in FVWM3 and updating FVWM2.
This mouse problem is only a very minor thing and not a show stopper at
all. I have a key binding that does it anyway.

-- 
Regards,
Chris Bennett

"Who controls the past controls the future. Who controls the present controls the past."
 George Orwell - 1984