I'm maybe mistaken but I found it confusing that ruleset is not enabled by default.
I'm using multiplerules option. When I delete all rulesets on server and go to sieverules plugin settings in roundcube, there is message that there are no filters and I can import default set. So far so good.
Problem is that after import I can see that I have some rules but I have no visible indication that my ruleset is not active. I'm 100% sure that this will be huge problem for number of our users and they will be confused why their rules doesn't work.
IMHO it is best to active ruleset by default if there is only one and we are creating new. And in any case display some very visible indication that ruleset you are working with isn't active.
Thanks for consideration.
Great job, thanks for such quick help.