Current User Signature Fields - Sales Insight

We've come across a few hurdles lately where we have been trying to dynamically assign a signature to any Lead or Contact inside of Sales Insight based on the individual sending the message.  If we had one to one coverage this wouldn't be an issue but in our industry we have multiple channels reaching out to the same Leads which puts us in our current predicament. 

We are still trying to come up with workarounds to handle our issue but if this functionality were added it would be very helpful.

Thank you