Throwable healing items?

It should be pretty easy to edit one of the 3 elemental Skeans into this using FF3usME. Just find the spell and edit it to a healing move. Then, in the "Battle Editor", find the Skean on the "Animations 1" tab to change it to whatever animation you want.

Changing one of the other skeans or scrolls should be possible too, but might require a bit of hex editing, since those re-use existing abilities. You'd just have to find the ability it pointed to and change it.

As far as I know it's not that easy to change since scrolls have hardcoded stuff.