Make "shift+enter" and "enter" reversable (so pressing enter doesn't create a new block)

I take lots of notes in class that aren't full sentences, and I use more of an outline-like process with lots of bullet points, some longer sentences, and some ideas "nested" underneath under sentences to indicate that it is a detail of the main point but not a main point itself. While I like the idea of blocks in general, when I am trying to type quickly I am not always thinking to do "shift+enter" in order to stay within the same block. When I don't use "shift-enter" and instead just use "enter", it creates a whole new block, which makes formatting later a pain and I end up having to essentially rewrite the whole page in order to get it formatted correctly. I will indent one block, and then the next block be unable to un-indent because no matter what I do it won't move past a certain point. At other times, I will try to re-arrange a block, and it will move to the very bottom of the page instead of just moving to the spot I am trying to move it to. I have to then move each block individually, and I can't find a simple way to combine multiple blocks into one block to make editing simpler.

I would love to be able to switch the functions of shift+enter and enter in order to make it so just pressing enter creates a line break but not a new block, and shift+enter creates a new block. It would make it easier to both take notes quickly, but formatting with blocks would still be simple and quick enough.