Is it possible to create feeds for multiple image category?

I have installed Media Library Categories – WordPress plugin | www.remarpro.com to overrule WP’s default image category system and added my own categories for images.

With the term filter list, I can successfully filter images belonged to my desired category. Now that I would like to have more than one category / feed. Say for image category 1 – feed 1 and category 2 – feed 2.

I’ve played with the feed url by this plugin, /feed/image/, but I am not sure if it is supported. Can you help me on this?

I tried to adjust the feed item number under admin > Settings > Reading, but even if I increase the number there, it still shows only the last 10 feed items. How can I increase that number for feeds created by your plugin?
Thanks for making your plugin available.