Hey @jendives , I’m not quite sure about the first part:
The only way for me to select other objects is to get to object mode, select and go back to edit mode.
I could be misunderstanding, but isn’t that the way it usually works? I’ve never been able to select other objects while in edit mode.
For the scale thing, try applying the scale with Ctrl+A (as a side note, I’ve noticed that there’s a dimensions bug in 2.8 Alpha, but I’m assuming you’re using 2.79 here).