Spell memorization Options

[Shadan]

I am new in IA. Played BG2 some years ago, now I want to try IA. I read that new version will come out soon, so I have a suggestion.
In PnP version you can memorize a lower level spell into a higher spell slot. At least it is in 3.0 and 3.5, I am not sure about 2nd ed. since I am plying 3rd ed. since years. So you can memorize for example one lvl 1, 2 or 3 spell into one lvl 4 spell slot. This would help when you need important buffs for example Chatoic Command, but you want to use some ohter lvl 4 spells also...
Just an idea for IA 4.3.

[Shadan]

OK, I checked spells mentioned here in the game. Seems my 2nd ed. knowledge is a bit rusty. Burning Hands D3+lvl (max. 20) - not bad if you can catch 2-3 enemies with it. That ST penalty at Spook is fine.
About Larloch: D4 dmg is irrelevant, but if I understand correctly what you wrote here, I can stop the game when I see one of my enemies started to cast, cast a Larloch on him with my mage. Since Larloch casting speed 1, it will distrupt his spell. Is it works? If yes, it is good spell. Even better than Magic Missile or Chromatic Orb what I use, since CO need an attack roll and Magic Missile is stopped by Shield or magic resistance.