I redid my house last year all in PEX and I ran everything to two manifolds I built Hot & Cold. I then ran all my runs in pairs in a homerun setup. The two outside spigots were the only two I just ran a cold line to and I have the two hots for those runs capped at the manifold just after the valve. I got to thinking the other day when giving the dog a bath in the house how nice warm water might be outside for that and other things on occasion. I know people have sometimes run a hot spigot to a garage and things like that but I was thinking of putting a tee just after the manifold on the cold line and teeing in the unused hot. I would normally keep the hot closed but if I did want hot I could open it and close the cold or turn them both on to get a mixed temp. I know this will work but not sure what code might say about doing this and kind of wondered if anyone has seen this before. I was going to cut it in the other day but saw I was out of tees.