haptics
 
Looking forward to this.   Looks like you are doing a great job! 
I like the idea of a larger opening.
  
Suggestion:   As someone who primarily likes to edge and goon, edging mode on current toys isn't that great for me -- I prefer full strokes and matching speed.  What I've done with one of my Keon sleeves is to cut it up a bit and make it looser -- this works better for me.
  
So, suggestion is to make an edging sleeve that is loose the entire length; i.e., the opening is larger for the entire length.
  
Of course, this would be optional/extra cost for only those who want it.