So a short slanted line is what you are looking for? Noted. Thanks.
Assigning tools to the Wacom pen switches are a matter of setting it up in your Wacom settings right? So just assign the shortcuts D for Draw and E for Erase. Or did I misunderstand?
4 monitors? Impressive! 🙂
Others have mentioned this need too. At least the X-sheet should be able to tare off as a separate window. Then it can be placed on a second monitor. Already my plan was to have a full view of your current frame, kind of as a reference, on a 2nd monitor. That is to come soon.