We can add parameter control knobs to an MCP using this menu:
>>>
https://i.imgur.com/o5zpIZZ.png
but, boy, is it painful
-- no scroll bar,
-- no mouse-wheel scrolling,
-- can only browse using the arrow keys at top / bottom,
-- and it only moves slowly,
-- menu closes after one parameter is selected.
Why not just display a subset of the Track Envelope window?
-- list the FX and their parameters in a grid,
-- with a check-box for each parameter,
-- and the Expand /Collapse check-box and the Filter, for each FX,
-- with horizontal scrolling,
-- and keep the window open until explicitly closed.
>>>
https://i.imgur.com/Jcon6Jj.png