While I really appreciate your work, I have one small request, that shouldn't be hard to solve: at the moment, you package standard directories.

While this was accepted in the past, it is not the current way to go. Instead of having just %{_bindir} in your %files section: can I ask you to package only the relevant files (%{_bindir}/pianobooster or %{_datadir}/icons/hicolor/*/apps/pianobooster.png as example)?