How do I add the number displays you show in the video?
Viewing post in Digital Logic Sim (old version) comments
I'm afraid it's not possible at the moment. Will see about adding it in a future version, just need to think of a reasonable way to add it to the UI.
EDIT: I've added this to the latest version. When hovering over the bar where you add the inputs, you can now press the + key to add more inputs to the group. These groups will have a display showing their decimal value. Still need to add an option to show the two's complement value though.