Yes, and that's my problem with it. Or rather;
it's ok for synths to
be able to hint that they use controls this way, but designing the
voice addressing/allocation scheme around it has serious implications.
Yes, definitely hint. Anal-retentive hosts will show it as an init-option
only if it is flagged as such. Synths still need to handle spurious and
incorrect events (fall through I'd guess), but it is a nice hint to the UI.