Hello!
First of all thanks for this great software! I really needed it and I'm also considering a small donation (just let me use it a bit before...)

I only wanted to submit my doubt about the use of hotkeys instead of a menu: hotkeys may be hard to remember, may conflict with other software hotkeys, they have to be enabled prior to be used, etc.
I should prefer if you plan to develop a mini menu on the systray icon where to choose the same options you provide with hotkeys so that we can do all the nice functions on the active window in a more obvious way (btw with the menu you're clicking on the option you want so you are sure you have selected the right one)...
Anyway, it's just a suggestion, do whatever you think could be best and thanks again for your great work.