1) The plugin architecture doesn't extend to GUI functions as yet. On the TODO list
2) See Preferences->Add/Save
3) Also on the TODO list
I've already acknowledged the "windows sucks" issue with folder structure. At some point in the future when I refactor the database code to make it backed independent, I'll add the ability to select a "large database folder structure".
Notice to all: I can not
provide assistance with DRM removal, for legal reasons, so please do not contact me about it.