[thcilnnahoj]

Hi and welcome!

1 – Yes. To get to it, open the parameter panel in the inspector (F4), click the menu button left to where it says Device and Mixer, select New MIDI Parameter -> Program Change. After you expanded the MIDI parameters folder, you can double-click the program change parameter in the list to create an automation lane for it on the currently selected track, or of course record it from your MIDI interface!
You’ll have to ask Frits why it isn’t one of the parameters that’s enabled by default.

2 – I don’t know about that one, sorry – maybe someone else knows.

3- There’s the tempo region above the tracklist (where it says “4/4, 120bpm” in new projects). You can create tempo events there, which you can set to change time signature and/or tempo. Currently, these only allow for linear changes.