Set automation mode from control surface

[Dberman]

I am trying to map a Behringer X-Touch One to Reaper, and one of the things I need is to map a row of buttons to automation modes. In Mackie Control User mode and using Mackie Control (Klinke), one button is automatically mapped to Write mode.

I have tried Realearn and changed my control to CSI, but I haven't stumbled across a way to map a button. The fader, rotary encoder, and jog wheel all work. The default mappings for buttons all work in MCU mode.

Am I missing something, or is this not possible? Most of the forum posts and videos talk about mapping encoders and faders. As always any guidance or assistance will be greatly appreciated.