Currently theming engine uses the same pan knobs regardless panning mode.
Also in "Stereo Pan" mode, Reaper uses "width" knob for right channel.
It all might be very limiting when creating themes.
I suggest to add following knobs:
- mcp|tcp_stereo_pan_knob_stack
- mcp|tcp_stereo_balance_knob_stack
- mcp|tcp_pan_left_knob_stack
- mcp|tcp_pan_right_knob_stack - to replace wid_knob_stack in Stereo Pan mode
Knobs should fall back to their respective parents.
Here are examples of pan knobs I would use, if theming allows this:
Stereo Balance mode
Stereo Pan mode