Is it possible, and if so, should it be done? There's some very powerful strategic options if they are implemented...
Additionally, now that I've got thinking about spells that weren't carried over between the Infinity Engine games, would it be possible to put some IWD/IWD2 spells into BG2? Some suggestions:
1. Seven Eyes - love the concept of this spell.
2. Cloud of Pestilence - there aren't enough evil spells to begin with.
3. Soul Eater - again, nice concept, and a satisfying masterstroke in lengthy battles.
4. Executioner's Eyes - divination got the thin end of the wedge in BG2, IMHO. Saving True Sight, of course, but that's about it. More criticals is never a bad thing.
5. Mass Dominate - could prove highly useful, especially when combined with Malison and used on one of the Throne of Bhaal "hordes-of-foes-charging-at-you" style of battles.
Likewise, clerics can be buffed up with Righteous Wrath of the Faithful, Unceasing Endurance, and Static Charge (indoor Call Lightning) etc.
Finally, how about a Protection from Good/Magic Circle against Good spell? Evil parties should appreciate it when dealing with annoying law enforcement types that try and hunt them down, and plenty of enemy clerics would find it invaluable at the start of a battle with a good-aligned party.
Granted, they aren't original, but they *are* useful. What do you think?