@viret56 - unfortunately, no. While QuickBooks itself may support more than 29 characters now, the QuickBooks SDK which we use to interact with QuickBooks is still stuck at 29. Our hands are tied. If we allowed more characters there, you'd be littered with conflicts, as none of your Estimates would be accepted into QuickBooks.
Here's a public SDK listing of the fields. http://developer.intuit.com/qbSDK-Current/Common/newOSR/index.html
(best viewed with Internet Explorer, and you need a PHd to know how to use their on screen reference guide!!!......but just in case you don't believe me, that's the hard facts!)
Paul