Flex Post Extended

Hi. I made this https://github.com/a4jp-com/flex-posts 10 months ago and though there would be an opportunity to help work on the code but maybe this is not being developed anymore. Is it okay to take over this or create an extended version with basic search fields as searching through a huge list of categories wastes a heap of time? Especially when there are 500 to 600 categories or more.

The page I need help with: [log in to see the link]