[NoOne]

global settings -> "Gm-legacy mode" checkbox is what you want to enable.

you will have control no matter who is coaching. (reputaion, controlling personality can usurp your control otherwise)

EDIT:
wait, you are gm and coach? that shouldn't be happening.. may want to double check depth chart and/or manager office options about delegation.

promotions/demotions are a seperate option form lineups/depth chart.. think it's mil/mlb differentiated too? better re-read them all make sure you aren't delegating accidentally.

all else fails, go check that option anyway for gm-legacy mode.. should only be needed for GM-only, though.

if you are certain it's all kosher, go make a bug report.