Just a suggestion, as I see some bug reports are not following the guidelines, would be that intead of having a normal New Topic form, to have a bug report window with different textboxes:
The first being problem description
The second being the attach capx form to upload one
Then the description of the capx
Then a textbox to make the steps
It might sound trivial, but if the user validates a bug report with no capx for exemple, it could say "please attach the capx corresponding to the issue" before the user can submit it, the user could choose to post it without, but he would have been warned if one of the requirement for a bug report has not been fullfilled.
If that takes too much time to make or is not interresting, please ignore that topic.