There is a switch out there other then SW44 that could be cascaded with regular sw21. It maybe not very well known, expecially in USA, but I've been told that few electonic/dish supplies stores over in Canada sell something by the name of sw21X (different from regular sw21). I've been told that it is custom manufactured by some company (or people). The only thing is it is much more costly then regular sw21. Example:
I ve been told that regular sw21 cost there around from 30 to 45 dollars Canadian (or so), where that sw21X switch would cost around 80-100 Canadian...
See the difference..
The way that sw21X switch works (or supposed to work):
One needs regular sw21 switch to be connected (cascaded) together with that sw21X switch...After that one can get 3 birds into one receiver...Note though: just one of those sw21X switches would not cut it - One would need a regular sw21 switch as well.
Speaking about Canada and switches - hehe - they should become more popular out there pretty soon - because Bell Expess Vu has it's Second satellite almost set to go...
I ve been told by some people - that it should be all ready to go by the end of the year, and they would start to use it around 6 months from now ( this of course is not official, just telling you what i ve been told

)