I would add Styles, and by inclusion, Conditional Styles!
But as I look at this list, it strikes me that we need something more. The real difference between the two platforms isn't so much a list of feature differences, but really one of capability and potential, if that makes any sense.
For example, you've included add-ons and scripts as two of the differences between FP and FM. But I think it should go without saying that these features are HUGE, in that they have essentially elevated FreePlane into a completely different product space. These wonderful tools have harnessed the idea of an open architecture where users can interact in the development of new applications/innovations. A quick look at FP's add-on page demonstrates this power:
- Insert InLine Image (an alternative way of bringing images into FP and attaching them to nodes via details or node core)
- Wikdshell (test platform for building and testing groovy scripts)
- Wikdnode (comprehensive set of node text editing tools)
- Pack and Go (ability to pull all FP dependencies into a single zip file for sharing with others)
- Study planner (tool for assisting with the efficient use of study time, including pomodoro timers
- Additional icon libraries
- Developer tools
- Getting Things Done (task management application)
While these "bolt-on" tools aren't technically included in a list of technical differences between FP and FM, they have significantly
improved FP's usefulness when compared to other choices. Clearly FP has grown beyond its origins as yet another mindmapping tool and now offers users a full suite of knowledge management capabilities--from idea creation all the way through project tracking, reporting and presentation. And because of scripting and add-ons, FP users have every reason to expect continued innovation. History has shown that the sort of collaborative power now embedded in FP always grows.
So as they say, "The Best Is Yet To Come!"
P.S. Maybe when we get a working list of the differences between FP and FM we could pull together a little video that would quickly capture how these differences are important enough to consider giving FP a try...