Holding area / to do list

I’d like to be able to hold time blocks aside before scheduling them. Like a to do list / shortlist that can be dragged into the calendar when I am ready. This would avoid my calendar becoming a dumping ground for tasks that aren’t intentionally scheduled (this can add to a feeling of pressure and makes things harder to reorganise). I’m trying to use aika to not only plan tasks but also save tasks that are yet to be thoughtfully scheduled. I’m using Swatches for this as a workaround then deleting the swatch when the task is scheduled, but i’d rather only keep longer term projects or repeatable tasks on there.