Entering an EFT code when paying of a bill by DD

HI All,
Is there a chance that we can have the option to enter an EFT code (The code the insurer uses to identify the transaction) when paying off an invoice with a DD payment?

I'm thinking something along the lines of how we enter the cheque number when receiving cheque payments.

If this was a searchable item it would make it easier when chasing down specific payments. I'm also thinking that it would make it easier down the track with the xero integration to reconcile DD payments.