Technically, if it says "chum only", then you are running afoul of the rules if you are intentionally targeting any other salmon. If it stated "catch and release", then targeting and releasing is OK.

More realistically, if you're fishing for chums in November, you're probably using gear and lures that are somewhat appropriate for silvers, fall kings, steelhead, and dollies. You can't really avoid catching non-targeted species, except by actively not casting to visible fish of the prohibited species.

I hope I didn't confuse you more!

Where are you moving to?

Fish on...

Todd