Would love the ability to add tags to notes, for easy note search/retrieval/organization. 

Related to this, I'd love the ability to set a default note color at the notebook level. I'd like all notes in my "Health" notebook to have a light red color for example, and all notes in my "Leisure" notebook to have a light green color. This allows me to easily visually identify my notes when doing a search, or viewing the "All Notes" view. Currently, every time I create a new note, depending on which notebook I want to put it in, I have to manually set the right color every time, for every single note. Very cumbersome. So it would be great to be able to set the default color of all notes created in my "Leisure" notebook to light green, and so on for other notebooks, etc.. 

And finally, the capability to select multiple notes at the same time and set the same color (or tags) to them in one shot.  

Hope that makes sense, and keep up the good work!