I really need that, in audio tracks.
So:
I have a mono track (dry electric guitar recording), which goes into a mono amp plugin (track stays mono until here) - and THEN into a mono to stereo chorus fx (and here i want the track to become stereo).
Waves also has mono to stereo plugins.
Please give. 
Is the monototereo included in the main fx’s in cubase not what your are looking for ??
No, but there are fx out there which would allow turning a mono signal, via EQ or modulation for example, into a stereo signal.
We can’t use that with Cubase, though, because in Cubase a mono track can’t turn into a stereo track at some point in the signal chain.
So what I ask Steinberg to add is the ability to have a mono track and mono channel which, at some point in the signal chain, suddendly turns stereo.
And the reason why I ask for this:
This morning I created my first (extremely sweet sounding) chorus effect in Reaktor - and I could use it to turn a mono guitar signal (virtual amp) into a wide stereo one… if only Cubase would let me without having to mess around with another unecessary group track.
It’s a purely technical request - to provide us with the routing option “this insert here turns the channel from mono to stereo”.
+1 please.
Old versions of Cubase used to make the track follow the channel I/O channels of the plugin, but since Cb4 (I think… also prob VST3 which drove it) they changed this to make the track have fixed I/O channels from when you create it. I think this has been a backward step in terms of flexibility - I used to use it a lot for most channels particularly guitars. Love to see an update which brings this back and allows us to choose the I/O config for each plugin.
Mike.
+1
+1
When you use send to stereo fx channel it works, also when you send to stereo group - both makes sense. Greets
+1