In my experience you definitely want them in a dimmer. Turning them entirely off during the movie is a safety hazard if someone wants to get up during a dark scene.
I’m very pleased with my Insteon dimmers, they are able to dim quality LEDs very very low. That said, I have yet to try my IR to Insteon “bridge” device, and if it doesn’t work I’ll have to use a separate Insteon remote rather than my programmable URC remote, but that’s okay with me. Just want you to be aware.