This might be fixed in v4.2.5.

I can't tell for sure, as I can't reproduce the issue.

There's the sndvol_tooltip registry option, so I'm closing it.

1 and 2 are fixed in v4.2.5.

They were caused by one bug, by the way.

As for 3, I don't think it's possible (without hacks) to display a "Only show notifications" icon without showing a balloon tip for it.

Anyway, it doesn't bother you, it doesn't bother me either, so I don't feel like spending time on this :)

Done in v4.2.5.

It's not very user friendly, but well, you have to set it up only once, and it works.

A tip, disabling global windows hotkeys:

http://www.geoffchappell.com/notes/windows/shell/explorer/globalhotkeys.htm

I've set Win+Q and Win+W to cycle between windows on my PC.

It wouldn't work without disabling the hotkeys for explorer first.

I believe you can achieve it by modifying your theme.