VKB-SIM

I have a STECS Throttle System Mk.II - Mini Plus, and MB1 is a mini stick used to control axis ROT-X and ROT-Y. I was wondering if I could program the axis to trigger a corresponding button when the axis is moved up, down, left, right?

Yes, you can by programming the ministick as a uSSw Switch, as shown in this guide (there are more options presented) - a different device is used in the guide, but the ministick has the same functions.