I think that adding customizable bookmarks on speed dial page would be awesome (message me please if this could be done already). I'm talking about setting an images to every single bookmarks. Right now bookmarks are just a colourful icons with text in it. For me, that's not really convenient. For example, for my gmail bookmark i want to add a gmail logo on it, in order for better visualisation.
In my opinion, this feature is not very complicated to program, but at the same time it adds plenty of individualisation to browser.
Btw, best gui browser right now, really appreciate your work and hope to help you more in future! Thanks!