In Pose copier Can i use the vertical slider with more than 3 drawings and for other things that the up/mid/down pose ?

I have a complex build, so I want to use pose copy for animation.
For that, if I understand correctly, I have to create 3 drawings and name them slh- then slv- and finally slx- for the pose up / middle / down
My question is: not having a pose up / mid / down then can I use the slider “slx” for something else? for example hands or expressions eyes ? and if yes then can I integrate more than 3 drawings ( 7 or 10 or 30 …)?
If it’s not possible how to ignore this slider ? should I create only 2 drawings slh and slv? Or create drawing slx and do not put drawings inside?
Thank you for your answers