Managing the work area in Blender always requires moving the mouse to a specific position to operate, which will undoubtedly affect the concentration of the work.
So I made this small plug-in to quickly join areas through a shortcut key and moving the mouse!
Then quickly split the area through a pie menu, and change the division direction in real time!
Update:
1.1.0 (2024.02.15 Added quick switching work area pie menu）
Hi, in case you didn’t receive my e-mail from yesterday:
I purchased it on Gumroad, but there is nothing, no add-on to download unfortunately. It is also taken down (temporarily hopefully?) from Blender Market and it is not listed on your main Gumroad page.
Did you forgot to upload the add-on or are you doing changes? Please let me know, thanks.
Sorry, I modified the code later, so the upload probably failed. I just re-uploaded it, and you should be able to download it now!
Thanks, successfully download it now, installed it and it works as expected! 
Update:
1.1.0 (2024.02.15 Added quick switching work area pie menu）
