Please make it possible to increase the font size. The font is nice but small. Zooming the browser means you have to scroll side-to-side. It would be great to be able to increase the font size - don't mind if I can only see one tweet at a time.
Please make number of tweets per 'more' larger, at least optionally. CrowdLens uses 200 as the limit, much higher than dabr/etc., and I find that works really well. It gives me enough tweets to read for my ride on the London Underground where there is no reception.
Please make it possible to have older tweets at the bottom, newer ones at the top. Again, CrowdLens does this, and I find it more natural to read top-to-bottom than bottom-to-top (generally, CrowdLens is neat, but way to heavy on the processor, the way it works).
Please get new tweets automatically, at least optionally, every so many minutes, rather than having to press for more. When getting new tweets, please don't scroll away from the current tweet (this is another thing CrowdLens got right).