Modify Se38 Screen

I want to create one tool which tracks all the reports which are created through SE38. Means I want to maintain one custom table which contains it's report details (Object name , number)... While creating any report it shows us one pop up which gets the info like title, program type etc. I want to add one custom field in that screen.

I haven't worked on User exits and enhancements. But I searched for it but couldn't find anything... can anyboddy help me ?