I have done a project in order to add MCFilemanger to TinyMCE in Oscommerce Creloaded.
I can use now MCFilemanager instead of a html form (input file) to upload and manage products' pictures.
I have to do some change (contributions added and [url removed, login to view] changed) and now i can update pictures' product, but i can't preview.
You'll have to fix it.
You have to add MCFilemanager as standalone to categories' pictures too.