1. No, not usually. In fact if you click on a second spell icon while the caster is still in the midst of casting the first one you abort the spell. Not only that the initiative counter is reset and the second spell will be cast much later. The only way to queue spells is to the special spells like minor sequencer, etc.
2. Spell sequencer is a level 7 mage spell. It is used to store up to 3 spells of level 4 or lower, sort of like preparing for a contingency. When cast you cast three spells one after the other. Examples of how to use it:
- Mirror Image, Stoneskin and Improved Invisibility.
- Two Skull Traps and Mirror Image.
- Greater Malison, Web and Ice Storm.
- Greater Malison, Emotion - Hopelessness and Slow.
- Haste, Invisibility 10' Radius and Spider Spawn.
3. Spoiler
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Have a hasted invisible character with the stew enter the area where the umber hulks are. There is a location where the jail cells are where the umber hulks tunneled in. At that location there will be a spot where you can 'use' the stew. Click on it and the umber hulks will come running.
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"Butt-kicking for goodness!" - Minsc
"Cities always teem with evil and decay. Let's give it a good shake and SEE WHAT FALLS OUT!!" - Minsc