This feature has been available in
Graphite since the original release.
* Cast Spell Window – Fully customizable horizontal, vertical or tiled orientation. Cast Spell Window collapses to a fixed dimension to retain view of the book button for loading and saving spell sets. Easy to edit built in keymap indicator. Open EQUI_CastSpellWnd.xml and CTRL-F search for “BEGIN USER TEXT EDIT FOR KEY MAPPING.” Change the lines <Text>#</Text> to match your desired keymap orientation.