There was a lot of enthusiasm for this project when I showed it off over the IRC, so now that the forums are back, I can show it off more widely!
Yep, I made an editor for custom score sprites. Since all score sprites so a set series of things, there is no need to code separate routines for each sprite, so you can just edit the tables via this tool interface.
There is no support for editing the existing score sprites, mostly because of the sketchy way the routines and tables were coded in the original SMW.
Oh, you want a download link, right? Here you go.
Keep in mind that this is only a beta, and a result, I would like some people to try it out so I can know it works under all circumstances.
-Tool will not prompt for save upon switching ROMs
-When prompting for save during tool closure, it will display sprite numbers twenty too low.
Now with extra girl and extra hacker