Tracking Standard Stamped Envelopes?

Hey everyone, quick question. I ship a lot of covers/flats using standard First Class postage (actual stamps, not metered labels), and the lack of tracking has always been a massive headache.

I recently built a small private browser tool "Postal Manager" for my own shipping desk that formats the addresses and generates the official USPS Intelligent Mail Barcode (IMb) right on the envelope, so I can actually track them through the sorting network just like ebay Standard Envelope does.

Before I polish it up, would a tool like this be useful to anyone else here for their own shipping? Trying to gauge if it's worth making public!