Unfortunately I don't think its gonna be possible to ever make our own content.
Im certain they got that all pretty well tied up with legality and would breach into
licencing territory. We've had these things for over 15 + years, 3rd party coding
like that would've happened by now. From what I see, Zoom are the only one's
stepping up in this respect. They add many extra FX and Amps in their firmware
updates aswell as the StompShare store they have setup for users to buy extra
modelled FX and Amps from a selection of around 70 items so far, and rising.
As for DSP processors, I see it this way.....
If they are going to advertise a design to operate 8 simultaneous slots at one time,
then I reckon they should deliver on that promise with an adequate DSP processor that
allows ALL 8 to be used simultaneously, in ANY combination of chosen FX/Parameters.
Assuming around %30 more DSP performance would cross that threshold, I would
happily pay the difference for the extra needed DSP, in a flagship model especially.
A far better alternative than starting again with an X version that still has DSP limits.
Kinda defeats the purpose of having dual-tone if you cant add much of anything else
to them. Im stickin to single amps, but even this config can run into DSP limits. Meh.