When the touchpad is switched off with the special button, keyboard is no longer usable. You can type whatever you want, but not a key response to you actions.
It can be fixed with a restart of the laptop. However, this is very inconvenient if you want to use the mouse and switch off your touchpad.
As I remember, there's no such problem in Helena edition.
Remote control works with not all applications. It's supposed to work with video and audio players and such, however it doesn't work with VLC and works with simple Movie Player. Volume controls affect the system volume, not of applications (that's good).