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Perhaps this issue of 5NT and bids of opponents suits at the 6 level would make a fruitful seperate posting.
(If pass is forcing the of course you have all these delayed 5NT and cuebid auctions aswell).
Ian
5NT offering a choice would be great if partner knew what he was choosing between. That is, I use a quick bid of 5NT frequently as pick a slam, choosing a slow approach clearly establishing trumps when I want it to be grand slam force. Here, of course, the slow approach has been taken away from you, so the geneneral rule of 5NT as pickem would best apply. But there are two unbid suits (hearts and clubs). So to offer 5NT as a pickem is a little risky, although partner having the master suit makes it not that risky. As long as both you and partner understand that 5NT is pick between some unbid suit and spades. After all, spades is the master suit. But what if partner thinks it is pick between the two unbids suits, say you are 1-6-0-6 for instance, and picks one when you belong in spades because you are 2-4-0-6 and he picks hearts on a three card suit?
Also, imagine an auction that goes... 1C-(5D)-5NT for instance. As a pickem between clubs and a yet defined major would be, well, very odd treatment. Playing pickem, maybe this should be an almost demand for partner to bid his better major.
It is not my intent, however, to delve into the finer points of the treatement playing a forcing pass. Since this is not what I play. Maybe Maybe Misho or Rado, who advocate for pass being forcing and the new suit being a fit nonjump can step in here and explain their treatments, which I am sure they can do better than I.
This hand, as they say, however becomes a problem of frequencies. What kind of hand are you most likely to hold that will be problems bidding? Let's examine the hands.
1) Long in diamonds - pass and pass partners reopen dbl
2) Spade support - bid spades
3) Short D, no S fit - dbl for "takeout"
4) partial S fit, short is D - dbl and rebid spades if partner's rebid goes badly for you (not real likely).
5) partial S fit, short D, good suit - bid your suit (partner with "long" D is less likely to reopen)
6) partial S fit, long D, good suit - pass, partner will bid again
7) no spade fit, long D, good suit - pass, partner short in D will bid again, now you can bid your suit.
This works for me. As this example grouping shows, with a spade fit, you are going to bid spades. With no spade fit, you are going to tend to want to defend, will have the other two suits. or will have a one suiter. The way I play, with the other two suits, you double. With one other suit and their suit, you can safely pass, as partner will reopen when short in diamonds. So what is the problem hand? Short in their suit, partial fit for partner, good suit of your own. Here if you pass, it can go all pass. If you double, partner will not be thinking rebid his suit, and may jump in the third suit (the one you don't hold). So the fit nonjump works nicely to fill in the problem hand.

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