Transition time is as easy as adding “data-interval=“#-in-milliseconds”” property to the carousel portion of the code Blocs exports. It was however added in Blocs 2.3 Beta, as Duration under Settings for the carousel. Understand however that 2.3 is not backwards compatible, so make a copy of your project if you are gonna switch to it for that feature or others.
As far as looping vs not looping the carousel, I don’t think that is directly exposed in Blocs to the users, but would be a another good candidate for the Settings of the carousel perhaps.
You can Google around to see how to prevent looping however, via some modification, here is one example: