[charly44]

There is a ➕symbol in the metronome window. It allows me to add multiple tempos to one song. Is this documented somewhere? I can't find any documentation for it. 

It would be nice, if I could automatically switch to the next tempo based on the number of measures played.

[Zubersoft]

There isn't currently an option to switch tempos after a certain number of beats. That's something that would have to be added. You can only manually switch metronome tempos using a touch action (Settings->Touch & Pedal Settings->Touch Actions).

Mike