Launching galleries is not officially supported at this time.
However, what some users have done is:
- Create an empty link for each image in the slideshow (i.e. a link with no text)
- Create a visible link (i.e. a link with text) to the first image in the slideshow
- Turn on grouping in SLB's settings
Now when a visitor clicks on the visible link, the other images linked to via the invisible links will also be displayed in the same slideshow.
Granted, this is a bit hacky and requires a bit of HTML knowledge, so this is just to show you what some other users have done to achieve this effect.
A more official solution is indeed in the works.