Layer Shortcuts does something like this. I use it for a while to create buttons on the workspace to select specific Switch layers that load into the Switch Selection Window. It's a great idea but unfortunately it breaks when you import the rig into another project. I hope either Wes can improve this or we get something comparable natively because, expect for the import issue, the is an incredibly useful idea. I made a video about it here...
Introduction to Layer Shortcuts
Note: I made this video before I discovered the import problem, which is why it's not mentioned there.
In the meantime, I've fallen back to Shift+Alt clicking over the visible artwork of a switch layer. This will select the group layer of the clicked on artwork, which can be a Switch Layer. If so, it will load automatically into the Switch Selection window. Unfortunately, there is a flaw with this method in that, if you tend to use groups inside your Switch layer (like I almost always do,) then this method will only select as high as that child art group layer and not the parent Switch layer.
(It's always something, isn't it?)
I have a few ideas to explore for making Switch Layer selection from the workspace easier. Will post when I have something satisfactory.