According to the DCS F16 manual "Missile Step. When in flight, depressing the button in EO or A-A mode selects the next weapon station. Depressing the button in A-M Mode cycles between CCRP, CCIP and DTOS.". In-game it cycles through CCIP STRF and CCRP, not CCRP, CCIP and DTOS like it should do. I believe in the real plane (at least for the F-16 block 15 MLU) you press Uncage on the throttle and that will go into STRF when in A-G master mode. In the game currently when you press uncage in A-G you go into LSS, while in the block 15 MLU you would press TMS left or right (not quite sure which) long and that will go into LSS.