zoo plugin upload images

we have a joomla site developed with extension zoo from yootheme. we used the catalog function for create a car listing website. During image upload we want to create a friendly option to upload and manage image items beacuse zoo existing option is not friendly. additionally we want to do an additianl quick task. QUICK TASK: Zoo category module is listing all categories. We want just appear categories with items. After this task is completed freelancer must tell us which change was done in php files for complete this task , in case the modules update we can do it again. IMAGE PLUGIN STEPS: 1. Click on upload 2. Select one or Several images 3. After images are upload will appear an list with uploaded images. User can set/change main image click an icon. user can delete or add more images. * main image will be considered as first image on catalog listing * remaining images will appear on zoo gallery. observations. 0. When images are uploaded the images will be uploaded with a random name different to any other image for dont rewrite files. 1. When images/listing is deleted the images will be erased from server. 2. must be created the thumbs and work with zoo image gallery. 3. Only one upload buton . user can select one or several images. WE dont want several upload boxes. 4. plugin must have option for decide max images to upload. Depending of user selection in options will appear an message saying EXAMPLE" 10 images max" 5. The plugin will resize the images. image resize will be controlled from plugin options. 6. Compatible with joomla 2.5/3.0 7. must be developed as a plugin for install using extension manager 8. we will own copyrights. we want to publish this plugin free in joomla directory. 9. additional observation= plugin must work for frontend submission is supposed that will appear in layouts configuration for decide if for a layour will appear the image upload feature or not. who knows zoo will know what im talking about