+1 for a toggle to open links in a new tab.
I would find this option useful because I write atomic style notes. I also try to treat note titles as concept handles. I find both practices assist in writing notes that I actually find useful further down the road.
However, as a side effect, I find myself jumping between a bunch of notes when following the thread of a larger idea. Having all notes open in tabs by default would be useful when refactoring and building on previous writing.