Whenever I try to add an instance account, Thunder appears to replace the instance I'm already logged into with the new one, so I can only browse one instance at a time. Is this behaviour intended? If so, will support for multiple instances be added later?
Guilty as charged. I'll say though, there are several legitimate reasons why one might want to do this. I personally use it as a substitute for Reddit's multireddit feature, by grouping community subscriptions across different instances by theme. As long as users use the same username across instances I don't think this practice should be automatically regarded as an attempt to sockpuppet. It that was the goal, the accounts would definitely not be using the same username across all the instances.