Well that all depends really. Does having unconnected nodes laying around take up extra resources? If not, i don't see a problem with just tucking extra one's away and making them unavailable if they can't be deleted. The whole resources thing was mainly why i mentioned the delete option, but if they don't then no troubles there.
Besides as you said, they can come in handy later (i actually found uses for them later on), so no big deal really, just be more careful not to hit the Num 0 key Denny.
