Internal hashtags

Like Bear app.
Where you can internally tag a tweet to sort it into folders or themes.
Lets say im working on a tweet that i know will be good for "productivity".
Then i can tag it #productivity and easily find it when i schedule.
It could work very well with folders as well.
So i would put it in a "productivity" folder and tag it "Goodmorning tweet" or "9am".
Gives the user a lot of flexibility