DUAL CHANNEL APPROACH...Questions to PMDG

Hello PMDG and others!!!!...about DUAL CHANNEL APPROACH...I've just made one with only 1 generator(and no APU)...I thought dual approach were only possible with two generators...Correct me if I'm wrong...I even tested dual channel app with only one engine...GS and LOC engaged in CMD with on problem...Maybe something for your "to do" list, if not already in...PS:the FMC manual doesn't talk about EO pages...I guess it's because you feel this is not complete????Also in FMC DES FORCASTS page, on line on line R2, can't enter QNH...do you confirm??? Only been able to enter ISA DEV...Thanx in advanceEssono Fritz