Is it not the case the Secondary buttons are now under the Aim Down Sights page
which you bring up by un-ticking the box that asks you if you want to transfer the
same button selection to ADS? I only had a brief look at it the on Saturday
not set mine up for ages, I installed the newer beta firmware.
I would happily give up the number of configs for space to run 3 sets of buttons
1 for hip 1 for ads and 1 for a constant set that runs while either Hip or ADS is in use.