1. Correct. On the H90, you can only assign P parameters to the P footswitch, A parameters to the A footswitch, and B parameters to the B footswitch.

2. The looper transport will always be displayed when either 1-button looper, record, or play is assigned to the footswitch. It sounds like this is what you are experiencing.

I would recommend using only the 1-button looper and not changing the footswitch assignment, or using a MIDI controller or 3-button aux switch if you’d like access to more looper transport controls.