I'm currently working on a package that extends the functionality of dblfnote. I've finished a method for placing the footnote rule at an arbitrary horizontal location (more specifically, centered on the page), and I'm in the process of debugging a way to have two column paragraph footnotes (which is coming along in a promising way. You can see what I have in my github repo).
The question is: how can I ask for help in testing and implementing these features? Is this the right place?
Also, how should I let people know about my work. I feel like I'm not the only person who wants paragraph footnotes in two columns. Can I ask a question about it on the main site, and post my package as an answer?