When pasting Text to the notes applet, the text is often formated. E.g if the text color or background color is changed, there is no way to change this via the plugin. I see different ways to fix this:

1) Add an option to prohibit this formatting in the first place
2) Select formated text → Right click → "Delete Formatting"
3) Paste unformated text via Ctrl + Shift + V as it is in many applications

I would be fine every solution. However, option 3 should be implemented anyway, since it is a frequently used shortcut.