WHBM, as you said there is very little seating as it is at present and whilst a holding line for pax in the gate itself may alleviate the problem of waiting on the stairwell, it would cut down on the precious little standing room the gates offer.
I only deal with F50's and J41's but even a F50 booked in the high 40's quickly fills the available space to the point where it's an effort to go from the desk to the exit door.
As you know, stands 9 and 10 share one gate and that really is 'cosy'
I feel the airport really has outgrown itself now and I look forward to any expansion starting asap.