No, but I have have kept diseqc none in settings for all signals connected to Mpeg2 Stb & I am getting signal on this Mpeg2 Stb too along with mpeg4 Stb.
My mpeg4 stb controls the diseqc switch and I have divided out put signals of diseqc switch into two one connecting main mpeg4 Stb & other mpeg2 receiver
I have not tried with two mpeg4 receivers at same time but I think it will work as same as mpeg2 is working but we have to disable all diseqc switch options in second mpeg4 receiver for safety as diseqc switch may get damaged
Remember, if my mpeg4 stb is connected to diseqc switch (port 3 for abs) & I tune my mpeg2 Stb connected to (Asia sat 7 port 2) then I am getting no signal to this channel unless I tune my mpeg4 stb to port 2