That would be a great feat to pull off but you'd need a lot of cooperation from the seagulls I think! I'm sure it would only add depth to the image if some were less sharp than others.
You need a seagull whisperer to get them to cooperate! Seriously, you are asking for a lot if you think you can get that many in one image to cooperate. Nice shot, btw.
This is a great capture. I would use a narrow aperture, but that could prevent enough light to cause a slower shutter speed, and they would create motion blur, unless you increased the ISO significantly.