Thought I'd added this one already but can't track it down.
Add the option to add a database or folder to a project and make it default, in one step by adding this option to the Right-click menu: "Add to Project and Make Default"
Currently you have to first add something to the project, then scroll around to find it, then make it default.
Based on the type of work I had to do recently I had to do double the amount of clicks plus an extra scroll movement EVERY TIME I want to add a new data container and make it default.