This is great, but small usability requests (from a Macbook user): 1. Scroll should scroll, rather than zoom. It seems to me scrolling the list is a much more

This is great, but small usability requests (from a Macbook user): 1. Scroll should scroll, rather than zoom. It seems to me scrolling the list is a much more common action than needing to zoom (which doesn't seem to be very useful as the writing becomes unintelligible quickly). On a Macbook/touchscreen pinch can be used for zoom, some modifier key in other cases. 2. Filtering on topics should remove instead of greying out, similar to what clicking on a line does. With the greying out you need to zoom out and somehow (haven't yet figured out how) zoom back in? Or scroll endlessly.