I know it's taken a long time in coming, but Baseline 1.5 now supports selecting and deleting multiple files or folders. Undo support is present as well (until you empty the wastebasket or rescan the volume), in case you accidentially delete the wrong stuff.
Baseline
+2
Baseline
A new version of Baseline that addresses the issues with deletion and useability is coming soon.
We've already got most of the requested changes in place, but are still polishing and debugging.
cheers,
Martin