Seems as if it may be playable after a NMFish auction, e.g.,
1C-1H
1N-2D
2H,
then cues etc with 3N being S/F on the ususal assumption that We have at least an 8-card major fit, etc. But what about a minor rebid auction, e.g.,
1D-1H
2D-something forcing
3H-? Is 3N here ever playable as S/F? Seems not, unless there is some agreement serving as a corollary to NMF, i.e., the "something forcing" is _agreed_ as asking for 3-card support, not simply allowing it in the course of a normal auction. But then We mess up our normal "let's find 3N after a 1m start" strategies, and mess them up in a major way.
Obviously, I haven't put much into this: I'm running off to a meeting and hoping the community will make up for my superficiality

Regards and Happy Trails,
Scott Needham
Boulder, Colorado, USA