Best but can improve!

This app is one of the best that i ve been using in the last couple of years. I always need to edit pdf files for my studies and i can recognise a fluent and well build app like this when i work on it.
Anyway it can definitely be improved in some pdf editing tools (cant believe there is only the possibility to highlight and not to UNDERLINE!!! PLEASE ADD THIS FEATURE!!!) and file management (different TABS to open different files???).
Hope this helps improving!

Giannn92 about PDF PROvider, v5.0