How much time do you think that would really save? All designs are a trade off. I also climb on the compact Bulldog Bone. If I have a tree that will benefit by using a tool that can be put on and taken off the rope fast, that is what I will use. It is a great tool.
The Hitch Hiker can do things no other single line tool can do. It has a proven track record that I have witnessed first hand of being capable of handling anything a climber can dish out. With a tool this rugged, you can bang, jam and toss to your hearts content. Unclipping it from your harness for a redirect and leaving it on you rope will work in almost every tree. It just requires a slightly different way of looking at the work plan. If it does need to come off the line, it can do that too.
So for myself, I would be hard pressed to alter such a well proven package for something as simple as not wanting to tie one stopper knot.