Through code it's possible 

Create a custom specific entry point for AWRKMEL

Write some code similar to below to set the EXP_EMAIL variable.

(I even created a field on the workflow screen where the user can specify an email address. If there is a value there then I use that email for the sender if not I don;t do anything and the user;s email is used.)

$ACTION

Case ACTION
When "EMAIL" : Gosub EMAIL
Endcase
Return

$EMAIL

 EXP_MAIL = "[email protected]"

Return

Through code it's possible 

Create a custom specific entry point for AWRKMEL

Write some code similar to below to set the EXP_EMAIL variable.

(I even created a field on the workflow screen where the user can specify an email address. If there is a value there then I use that email for the sender if not I don;t do anything and the user;s email is used.)

$ACTION

Case ACTION
When "EMAIL" : Gosub EMAIL
Endcase
Return

$EMAIL

 EXP_MAIL = "[email protected]"

Return

Can this be set up in a way that it will only use the specified email when specific workflows are ran?

Hi jtansey I have written a customization where I added a custom field on the Workflow called "Sender" and a Custom checkbox that that executes only when the checkbox is checked.

Yes it can as I wrote in the parenthesis, I created a field on the workflow where I can specify the sender email's address for that workflow and if it's blank then the system uses the user's email.