individual signature for multiple participants of SMS on a single DID

We have 6 techs that use our business line to communicate with customers. I would like to see the option for a short 'signature' so when they respond we can tell what individual responded to our clients. Currently, it just appears as if each tech has sent all messages ...when looking from their sessions. 

It would also be nice to be a 'per-tech/per-DID' setting, so signatures can be enabled/disabled or altered based on these properties.

Thank you