But you also need the UI to suggest bidding, which is not that clear. I mean, I guess I would expect to be ruled against if I had bid 6c, but that is because it seems to be practice that hesitation = extras, even in cases where that seems absurd.
FWIW the only times I have ever seem my partner make a slow raise to 5m he was thinking about 3N. He has loads of slammy things to do and normally picks one if he is thinking about slam. a hand like QJx K AKxxxx Qxx for example might be in real difficulty over what to bid opposite a sound 3C preempt. Anything could be right.