Hello and sorry for the very late answer.
Hmm - have you tried the -2 option
I tested the "-w" option in fullscreen and windowed and it makes no difference.
Is the option "-2" from your quote another one or just a typo?
With the option "-w" the mouse still disappears while in battle or simulation and doesn't comes back until game restart.
This happens maybe in 1 out of 20 battles. This mouseless battle is of course very difficult to play and win.
Otherwise than that... the game runs very smooth with no problems!
Thank you