Would Heyurians be interested in a navigation script? I have created one for my personal test instance of Heyuri's software. You can use J and K to navigate up and down a thread, respectively. F and D to navigate up and down post-by-post. Use R to reply to the selected thread. Use B to go back to page 1 or refresh the page if you are on the first page. Use C to type in the text area and S to type in the subject text area. I plan to add H to navigate to the home page (www.heyuri.net) and other keys for navigation between pages.

I can create a pull request if desired. I could even make it toggleable in the settings menu