There are many ways to skin a cat, but I would assume the simplest way is the best.
I started off with a more complicated setup, including dimmable cabinet lights, side lamps and a universal dimmer setup. Soon realized that I did not use any of it, so ripped everything out during an upgrade. Now I have a very simple lighting scheme in my small theater consisting of three rows of pot lights, each on their own dimmer, with the center row controlled from my main system remote. If there was a stream of new guests I might have left the "Wow" lighting in place, but my family and our hand full of good friends really don't care after the first "Taddaa!".
- On when picking out a movie from the drawers under my screen or jacking around with the electronics, but otherwise off.
- On when entering or leaving and for non-critical viewing. Completely shielded from the screen to prevent image washout.
- On when my wife is watching with me because she insists on crafting. Not very elegant, but I have unscrewed two of the bulbs, leaving only the one directly over her chair.
For cleaning or finding lost wallets, all lights come to blaze, but otherwise it is a very subdued, projector friendly environment. I would do exactly the same if I ever built another room (but maybe put the wife's "craft" light on it's own switch
Your room is 3X the size, and will likely be 3X more professional than mine, so perhaps a fancy lighting scheme is in order.
All I know is that for me personally, it would be a waste of resources.