Single click to open a note should be an option
In many other note taking apps (evernote, etc), single click is the default to open notes. I find it faster than double click. This won't make as much sense until auto-saving is implemented although, that way you don't have to interact with saving dialogs.
You can make it only clicking on an non-interactive area, such as the title field or anywhere but the check mark cause the default open action.
Max Pittsley commented
I'm using TagSpaces on a Surface Pro 2, and noticed that they actually DO have this implemented... in a sense.
If I use my mouse, I must double click on an entry to open it. With touch, however, a single tap opens the file. It would be incredibly simple for them to add an option to turn on single-clicking, as you've requested, since the feature is already there for touch input.