Media Gallery Querystring

I was looking to use the Media Gallery webparts (gallery/filter/folder tree) but with querystring paths different than the defaults, for example "folder" for "path" and "toyid" rather than "fileid."

I've updated the appropriate fields in the webpart settings for each that I have on the page, but am having issues with the gallery webpart and the default transformation.

The default transformation is using HTMLHelper.HTMLEncode(MediaLibraryFunctions.GetMediaFileDetailUrl(Eval("FileID"))) to create the URL to the image's detail page (ex: url?path=name&fileid=123).

I know I could simply modify the transformation to use something like "url?toyid=" + Eval("FileID"), but I was wondering about the mechanisms to the MediaLibraryFunctions.GetMediaFileDetailUrl? Is it possible for it to use toyid rather than fileid in creating the URL to the details?

Also, how are the File ID's assigned? We'll be directly linking to these in the future so I need to make sure the URL to specific images won't change. I know I could use the permanent link directly to the image, but we'd really like to link to a page with the image details on it as well.

Thanks in advance!