This feature request relies on either of two other feature request having been implemented first.
The 'other' Feature Requests :
Allow ProChannels to be managed from Plug In manager.
Allow Prochannels to be sorted by users by simply dragging them (which I think requested they could have folders).
With eithetr of these in place, I think it would be cool to allow user FX chains to be added to the Prochannel menu. If I've created groups of Prochannel modules, and one is called 'Dynamics', I can ad an FX chain to it, and for say delay
Examples:
I convert TS-64 to a Prochannel Moudule using the FX Chain, so I can store this with other dynamics.
I convert BT Oil Can Delay to a Prochannel using the FX chain, so can store the with other dynamics.
I don't use the chins as such, but the same would apply if you created a vocal strip from 3 VST, you'd stor it with other vocal strips you may have made.