Funny. I don't really ever think about it. If it's for the sake of learning a song, whatever skill or lick I would learn is for that song but I assume that some day in the future I'll use that skill/lick elsewhere.

If there's any integration, it's in my warm-up/'try-a-guitar-at-the-store' licks; I'll add it there if I really dig it or want to keep on playing it. Any example was from reading a George Lynch thing where he said that you can almost play any note on the fretboard for whatever key you're playing in, so long as you resolve the right way (eg - on a root note, for instance). I've played many George solos in my day (he was a fave) but never thought about it that way. Silly I know. There were a few licks I noodled out with 'out notes' and they somehow fell in to my warm-up licks.