Hi Wolfhouse,
Thanks for your feedback! I added your first request to our feature request list.
Here the good news:
“When an inter app audio track is frozen, let me use the inter app audio app for another track”
This is already possible, simply remove/reassign the inter-app audio app from the frozen track and assign it to another track manually.
“When i mute an unwanted track, then solo another, and un-solo to continue,it should only unmute what it muted, not unmuted what was already muted when i solo’d”
This will be fixed in 1.7.2!