[Wintermute0110]

Ideally Kodi should be launched in windowed fullscreen mode for emulation (That's conclusion of an old discution with Angelcry... Advanced Launcher Author)

Mmm.... I think that greatly depends on the operating system. In Kodibuntu both Advanced Launcher/Advanced Emulator Launcher work great with Mednafen and Retroarch with the default settings (keep Kodi window maximised at full screen). The only thing you have to do is make sure Kodi is running within a window manager, in my case OpenBox.

I'm afraid that most of the problems that require Kodi to minimise, introduce delays before/after launching, etc., are because of Windows.