[ScreenPack] How do I add custom sprites for each option in the menu? (and two more questions!)

[ReDoDo]

this picture is for visualisation. it's not in-engine, I made it in krita:

https://imgur.com/LTCDrZc

(I hope it looks like an Image and not a link... TT, I hate imgur.)

1.  How do I change or add a custom select box? I can't figure out where the sprite for the "menu.boxcursor" is. can't even change it's size really.

2. How do I add custom sprites for each option? like when your boxCursor is on the arcade it shows that kung-fu man graphic (pictured above) and when you move the cursor to vs mode it shows something else. I can imagine some really torturous way to do it with custom fonts... but isn't there a more legitimate, easier method?

3.  Is there a way to have multiple pages in the select screen or scrolling or... whatever that lets me put bigger icons in those larger rosters?

...and can you apply shaders on screenpack sprites like make it darker that way ,instead of adding an extra sprite?