When I started pigging 10 years ago and the development was still active, I asked Marc about automating mutes/solo with commands. Marc said he didn't see the point and I wasn't able to convincingly explain it to him because, to be honest, there isn't one
10 years in and I can't remember a single occurrence of me thinking "damn I wish I could automate those"
what you are describing can be done easily with KILL and VOLM as bleo pointed out.
Keep in mind that the soloing isn't hapening at zero crossings, and is thus clicky as fuck to start with.
finally, regarding " if i could duplicate 3 phrases instead of 5 just to provide a 3 channel solo" I cannot fathom what you are talking about but remember: less is more ;P