There is no special spell to help spellbot faster the only way is to use the
spells. However, if you concentrate only in one spell color it will be faster.
Also, you don't always use the same spell, use two spells
for that color.
If you were doing your green spellbot, it should be something like this:
Syntax : cast stone
Syntax : cast pass door
Do not spellbot in Temple of Midgaard or any safe room it will not work. Why
don't you try 'The Sphere' that is up from By the Temple Altar it's perfect
for this sort of situations.