Scapple is my preferred mindmapping tool! I love its interoperability with Scrivener.
I would love to have the ability to import items in a .csv file as notes.
A lot of the qualitative data I work with comes in (or can be exported as) .csv files, and Scapple is my favorite tool for manipulating and visualizing qualitative data.
Being able to import spreadsheet data as notes in Scapple, as simply as this, would be amazing.