First off, great app! This will really simplify sprints for me.
When I create a new sprint utilizing Scrumbler > backlog > plus symbol next to the sprint drop down, all of my custom issue statuses and custom trackers are left off by default. There should be a Scrumbler setting to set your default statuses and trackers for each new sprint.
Also, when I add my custom trackers/sprints, positions for existing items do not auto-roll down based on the number I choose.
I could live without the auto-roll down fix if it would just default all my custom items and use the same standard positions that are already set in the admin settings.
If you check your custom trackers and issue statuses at "Scrumbler settings", they will be active for all new sprints by default.