If the iris tb works as it says it does and the right size is matched to your engine its doesnt make it a F1 or comp use only so your statement of no is open to criticism.

They would open as quickly as your foot allows, im my understanding they cause no obstruction to airflow.
The iris design centrally focuses the flow away from the walls of manifold so perhaps a quad iris setup will be directing the charge in a more biased method.

watch the videos on Bakats links it shows the modification supposedly improves atomisation, and some kind of turbulent vortex at low pressure intervals. Im not convinced it works either but until someone tries is or proves it wrong Im open to the idea(s) as you never know.