One of the features from Adobe that we miss with Bluebeam's document-combining workflow is the ability to split a document into pages and arrange them along with other documents.
I believe 80-90% of our workflow with this could be accomplished with the ability to select a subset of page(s) from a PDF document, which could then be arranged in the Stapler tool around other documents (or other subsets of documents).
Even a "limited" version that only used contiguous page ranges would still be a huge help, as currently the main workaround seems to be first extracting a document into separate pages/ partial documents, and then using these resultant parts within Stapler.
Being able to work within stapler (and save those settings for repeatability) would really take the tool to the next level!