Extend the Add Feature commmand with workflow input

Hi guys.

I was wondering how I could 'intercept' the save option on the OOTB Add Feature command, and present a workflow that prompts the user to select from a pre-configured list of fire/incident names... they choose one, and it populates a field in the back-end. We want users to not type incident names as part of the add fire area feature (Add Feature). We do this currently with a custom module in the GVH5, but is there a way to potentially do this with Add Feature/Workflow combo perhaps?

It seems like it might be possible, using a custom command somewhere to run a workflow, but just finding the where to 'attach' the custom command to is proving beyond me!

thanks in advance

Gareth