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SypherPhoenix found the
list of mode IDs. Can anyone make a DOL patch for 1.02 that replaces single-button mode (2C) with debug mode (06)? I tried but couldn't find the proper location in the DOL that single-button mode's menu item was stored.
edit: Sorry, I thought that list was buried. Turns out it's on the most recent page. (I found it using Google.)
To make up for my egregious error, I've created a few IPS patches for the 1.02 main.dol. Patch these with Smart IPS, Lunar IPS, etc.
http://www.mediafire.com/download/gxubhgjdd4ul8zv/SSBM_v1.02u_Main.dol_Patches.7z
The benefit to using IPS patches is you can very quickly add the edits that you want to your game. You don't need to muck around in a hex editor. However my desired edits are very particular so you'll probably have to make your own for things like 4-stock default, no airships on Corneria, no transformations on Pokemon Stadium, etc.