I think in BaseCamp, using the pencil icon (insert) tool to tack down a route inserts either "via points" or "shaping points" I am not sure which, but definitely not way points. That is good because you can bump into way point limits per route on some/many of the GPS units.
Sorry, had a brain fart. Meant to say "via point" when I mistakenly said "way point." The point was, pun not intended, the longer you have between clicks when making a route, the more opportunity the Garmin routing software has to create unexpected adventures for you.