The option to add once only activity that dont clutter up the long list of activities#289

One thing I really hate is the ‘activities list’ that I can pull previously made activites from, if I have an activity which I will only ever do once it pops up in the list. This list is really cluttered and repetetive and one of the worst features. I would like an option to not save an activity in there if it is a one off task.