This advice is probably too late for you but: Don’t install the package trac-accountmanager in debian, seems broken. Install the plugin directly with “sudo easy-install …” as described in track-hacks.org
Corolary: why I’m using ArchLinux? Speed. And also because I have about an 80% less packages installed by hand. Also I can contrib easily with new packages in AUR.
It was not easy to find out what was the plugin or hack that the people at my work have done to have the beautiful fields “Add hours to ticket” and “Total hours” in trac, doing some googling and didn’t understant the confusing results.
So, I have the idea to search for it in the trac which I know it is working and I found a doc page in the wiki that described what have been done to get those fields, after reading it two or three times I realised that this page was added by a plugin: the “Timing and Estimation Plugin“.
Well, nothing more to say, it works perfectly, thanks to trac-hacks.org people!