Target Self Key - how can I make it work?

I recently started playing RIFT again, and this time I prefer playing a healing role. I had a question about the target self key you can set in Settings > Interface > Combat. I disabled Auto-Self Cast as I prefer having a modifier key held in to cast a spell on myself (Like in World of Warcraft - You hold in Alt (by default) and press the skill you need to self-cast)

In RIFT I tried to get a similar setup - In the Settings menu, described above, I set the Self Cast Key to Alt, applied my settings and returned to game. I have a healing spell on [Shift-2], which, I expect having to press [Alt-Shift-2], the spell will be cast upon myself (but it doesn't). I would like to avoid creating macros all over the place just for this function. Are there any other additional methods I could try to get the self-cast to work?

I unbound the 'Mark Target' Keybinds (which by default is [Alt-1] and up). Pressing [Alt-Shift-2] attempts to cast my ability which is keybinded to [2]