Thanks for the component you provided for shared cursors in text areas (https://github.com/convergencelabs/html-text-collab-ext). I've been using it with ShareDB, and have been working on adapting it to work with single text inputs, which has been surprisingly difficult (mainly dealing with scroll/overflow behaviour).
Our pleasure! If you want to share what you are doing we might be able to incorporate it into the utility for you! Happy to support a pull request, or to work collaboratively on it.