That sounds like it would be really helpful, but I don't think that is an option
You would probably need to create a "Banquet Points" class and a "Seating Points" class, and have separate focus points for each. Naming the focus points would require some time (B'A, B'B, etc) and then changing the focus in the Object Info pallette would take a bit of time too
If you are working with a small number of fixtures, you might create duplicate layer so you only set your focus positions once, then bounce between layers for the different views
Use viewports to speed up the rendering!