About your suggestions:
+ add BACKUP & RESTORE buttons
Before we released the first version of WPU, we have considered this Backup/Restore feature. But finally we didn't add it.
How to back up before uninstall a program? Back up all files? It will costs more time and disk space.
Create a System Restore point?
If user stops Windows System Protection, we can not create a restore point.
If user install a program in a non-system drive, system restore point cannot restore the program.
We know, Windows can not keep unlimited system restore point records, depends on the system drive space, when the records over the limitation, the earliest record (the first one system restore point record) will be removed.
So, we add the uninstallation Log feature, you can know those be uninstalled programs, and you can re-install them by yourself.
+ add SETTINGS button
Which settings do you want us to add?
I think WPU is very easy to use. No need additional settings.
+ would be nice, if i could change SKIN / COLOR
Change color, maybe we can add it.
About modify Bitdefender, we will test it and fix it in next update.