Add Folders to the Smush

Hey there, great plugin!
Is there a way I can add folders? I use a media grid plugin wich puts files in a “cache-folder”: /wp-content/uploads/ewpt_cache. Those pictures are not being shushed it seems.

Some (maybe helpful) information for you:
– GIF files killed the optimization process. I had to remove unitil after the smush process. If I may ad a little feature request here: It would be great if one could choose file formats for the smush process.
– I ha to add a file resmushlog (777) to my wordpress-root in order to retrieve log informations. The file was not written by resmush until I uploaded the empty file to the root. Could help with some debugging in the future.

Best!
Benedikt