Hi Rollins,
Because its odd to type layi for LAYISO & layon for LAYERON.
Because the shft+number keys have no use in autocad you can assign some of them for shortcuts.
See the Screencast to Customize your keyboard shortcuts.
I use SHFT + 1 = Selectsimilar
SHFT + 3 = Layerisolate (didn't use 2 as we may need this key for entering @ for relative and absolute methods)
SHFT + 4 = Layerunisolate
Here I have Shft+6 for Layerisolate & shft+7 for layerunisolate just for reference. Youu can use 2 & 3 or any number instead of this.
You can also refer the bleow link for more details regarding customization
goo.gl/YSErsf
2nd method is as metioned by Mr. Ara neresesian using the command ALIASEDIT.
Cheers,
Vinay Vijayakumaran
