On most of my school musicals the cast will take a bow for themselves, and then gesture to the Orchestra, another bow for themselves, gesture to the booth, and then open their arms to the audience before taking their last bow.
Because the booth is just some black painted stage blocks with a couple of tables (with some black serge drapes to hide the tangle of cables underneath

) at the back, the LX and Sound guys (usually myself and a friend) are very 'in the audience' and usually the audience will turn and look at us when we are gestured towards.
I guess it's a nice touch, but not entirely in my image of 'professional'.