As practicing controlled breath over natation + auto hypnose (and some others) guess it would be possible, on some extends at last (3 mn on water, not sure otherwise, as it is quite different out of a closed off environnement (not like they are a lot of equipment available to check that).
The interface is correct as long you do not have to many girls in it.
On the girls location menu, it should be on a separated menu (side or under/upper from the items category selection area).
Jeweler, if it is not that there is a single item in the craft list, it would mean a code error ?
Anyway, progress is always good, hope the game get to see even more features.
Edit :
Since editing the interface file, I've several second of wait between an item transfer, so, I guess it is (?) a question of priority ?
Guess Ill go for a switch between the vanilla & edited file dependant of what Im doing, still.