PROBLEM: all conversation tabs are essentially the same, with little to no clue as to what is happening in each one of them. Salespeople find it hard to understand at a glance what is pending and what is yet to be done.

SOLUTION: introducing conversation tags (even customizable, just like regular tags) could change this - once someone has answered a customer, say, via email, they could tag the conversation as "waiting for offer acceptance" as a reminder of the next step to take.

This is already implemented in other softwares, such as Spoki, and it really helps organizing the conversation tags.