[hpsdr] multiple receivers - is it really nesesary

[alex]

on the hpsdr website there was talk of having multiple receivers on a 
single mercury, on the qs1r site it talks about how it is possible to 
fit 7 independent rx into the fpga.

what is the point, if you want to have multiple bandscopes (like w3sz's 
mac setup) then why go to all the trouble of having demod-able signals 
just for the bandscope, by tuning the lo and simply recording the 
amplitude of the if then you get the frequency info without having to 
worry about doing an fft,

infact this could drasticaly reduce the computing power needed for 
normal rx by having the demod and fft seperate.

(i hope that makes some sembelence of sense)