Request for 'Selection Brush Tool' Fill

Hi, I just wanted to share an idea I had for the 'Selection Brush Tool'. Often I find myself holding shift with the tool to create straight lines round the edges of the area I am trying to select and then 'colouring in' the shape I have created for my selection. Would it be possible to add a feature that filled in the area that has a selection on outline. If that makes sense. So for example if I drew a square with the selection tool I could CTRL + Shift click (or something similar) in the centre of the square to add the full square to my selection. I feel like this would make a lot of my work waaaay more efficient 🙂

Thanks for taking the time to read!

Tom