So, i understand your major issue is the storage capacity on the server?
Are you familiar with the three images wppa uses? I mean source, display and thumbnail files.
You can switch saving sources off. Advanced settings -> Files -> I -> Item 1
If you do not use zoomable images, you can downsize during upload, so the display files will be smaller according to the settings in Basic settings -> Photos -> I -> Item 1.
So, limiting the max pixelsize during upload is not really necessary
Your example of 2000 pixels will be large enough for normal screens, so you could set that limit systemwide, unless you use the zooming feature.
You can delete …/wp-content/uploads/wppa-source/album-{album id} by ftp anytime
I am willing to add functionality at any time as lomg as it looks useful and comprehensive.
– If an option would be to selectively save sourcefiles on an album basis, it looks to be a usefull addition.
– Also a switch on the album admin page to delete the sources of that album.
– If you really need it i could implement the size for resize during upload on an album basis, but that can cause inconsistencies when photos are copied or moved to other albums.
To make it simple: If your issue is the storage capacity on the server, the safest way without loosing original images would be uplgrading your hosting contract.