You can just use the Change quantity of selected item just change the number? no need for that option
I did the exact same thing as you but it doesn't seem to work, thought I was the only one who had this issue.
In addition, I tried being completely empty and completely full to see if it triggers the "infinite source points" but still failed.
Is there a possibility to make it work outside of battle as well?
It's really a shame that you can only use it in combat, I often need to use Bless or other Source spells outside of combat. 🙁
Any chance of bringing +137 editor back?