The first time a user subscribes to a topic, it makes sense to take them to the page explaining that they will receive an email for each post and are only subscribing to the topic and that subscribing to the underlying list is a different thing. On subsequent requests though, no value is added and it requires an extra step/page load. In that case, it seems like Options->"Subscribe via email" should just execute without any further steps.
Thanks for a great service! It's a pleasure to work via Nabble instead of the GNU archive interface.
We are glad that you are enjoying the service. Your request will be taken into consideration to join our backlog but for now we have more urgent needs to address.