I think this is just an "angle of approach" kind of thing here.
A smartlist
is a saved search. If you need a reminder regarding the syntax, you can open the smartlist for editing, hit the import/export button, view the search string in there and be instantly refreshed.
MC also has a "Notes" section... (If you don't see it, enable it by looking in "Tools > Options > General > Features")
You can keep an inventory of search notes and examples in there, apply keywords to them, and reference them at will.
I did this for a while, but really, after some time, you reach a point where you have MC set up, running sweetly, providing everything you need, and you will find that you rarely need that list.
If you create some expression columns in a view, you
can save the view, but more on that further down.
You could also save the set of columns as a preset, or, preferrably, as glynor has said, create a custom library field from that expression and then you can add it to any view you wish on whim.
Saving/loading views.Here's a post I made nearly six years ago that is still valid today.
ClickCustomising/Creating viewsAnother couple of old posts that are still useful and current can be found
here and
here. For "cleaning, maintaining and fixing", I created a "Workshop" group in the tree. Under that, I have "Audio", "Image" and "Video", just like the defaults, but under
those, I have views set up that allow me to deal with auto-imported stuff, duplicates, offline media, leaving the default media tree nodes to contain views specifically for browsing and enjoyment. You don't have to copy that workflow, I only mention it to give you an idea of the power available to you with the MC library. You can set it up
almost any way you need, and then forget about it because everything you need will just work, and you will be happy. It just takes a bit of time, is all.
Finally, everything to do with your library and MC settings (except plugins) are saved in regular, automatic library backups. Look in the JRiver directory in your Documents folder. Your library is everything. Make backups of the backups folder. If you're embarking on some testing, make manual backups, then, if it all goes hopelessly pearshaped, you can restore in a few mouse clicks. My library is twelve years old now.