I use the bicycle components list to keep track of how much km my tires, wheels, chain and cassette has done. But I quite often swap wheels between bikes, and use a thin, quick tire sometimes in summer, only to swap it in bad weather.
Right now you can remove items, by "do not use" them. You can not place them back, or swap them out with others though. Only way to keep track of milage is to keep count in the comment section of the item.
So, I would like an option to put a wheel in the garage, by "do not use" them, and would like to be able to later place it back on my bike...