Directory wildcard or token value search

Issue Summary

One more request that I feel would be great for this module.
By default, all the images have to be under one folder.
There should be an option to add a wildcard search to the image folder field like --> /*
This would enable administrators that upload via a token value, to keep folder integrity intact and "clean".
On my site I use the imagefield thumbnail folder like this, "sites/default/files/uploads/thumbnail/[user]",

[user] allows me to easily identify the user that has uploaded the image, keeping my folder structure clean, which is very important to most everyone that uses any image upload modules.

Of course, any admin would have to make certain that all folders underneath the main folder directory would be accessible and not to have anything there that shouldn't be seen.
Again, great module.. and thanks