It would be nice if every time a select something it would automatically reserve it - if not reserved by another.
It would also be nice if EVERY dialog had an option to reserve the element(s) it involved,
Including reserving all text found in the Search and Replace Text dialog
The first one is already included in BIM Cloud called Reservation Assistant. This is not part of BIM Cloud Basic which is the new name for TeamWork.
For the second one, once you have used Find and Select to get the items you can use a shortcut (if defined) to reserve selected so no need for an extra button