Resize on upload renames files - bug?

I am trying to upload a (big) bunch of pictures to my Gallery (G2). Since I don't want to keep the highest-rez version of the files I do a resize on upload.

Unfortunately all the file names get changed to resXXXXXXX.jpg where XXXXXX is some random string of numbers. This creates problems for two reasons:

1) the original filenames had some meaning, which get lost (along with the possibility of setting a somewhat meaningful caption from the filename on upload).
2) I can't tell at a glance which series of pics were uploaded and which were not.

Uploading without resizing doesn't change the filenames but it takes forever and then I have to go through every single album to delete the high-rez files.

Is this a bug or a feature?