There are going to be alot of keys unused in WWI planes, because the functions just didn't exist then...
Simple handsignals system would be best in the air.. Using the unneeded keys... No in air 2way radio is a major part of the WWI scenes character!
Allow full coms on the ground, but when ya start rollin, handsigs only... Until ya stop again!!!
Players will adapt, they always do.... It'll be part of the WWI experience!!! Enjoy it!!!
RC