Imagecache, Webform and auto-folders

I'm trying to get the Webform module to work with Imagecache.

I know imagecache presets can be assigned in CCK by associating a preset with a Content Type of field type file (Content Management->Content Types->Edit mycontenttype->Display Fields). But I'm curious how to get Webform field file types to work with imagecache. (There's no Display Fields option when building a form.)

Normally I'd ask this of the Webform project. However, isn't there a default way of getting imagecache to automatically receive images and convert them within their preset folder? (i.e. from one tmp/preset_name folder to imagecache/preset_name folder)