Do you realise how powerful Imbue Spellcaster is for the Empire factions? Having 5-6 casters leveled to 10 essence early on is brutal, especially when you research demon spy and can summon one creature each, with the ability to do 10 dmg to all enemies. Thats an easy 60 dmg to all opponents on the field waay before the kingdom can get magic that good (the kingdom dont get demon spy at all).
Teleport is good, i like that the 2 factions are different. Moping about overpowered abilities leads all too often to all races/factions becoming equal, as in the same. Having different levels of power in different areas is what makes the game strategic, ie empire have early game spell power, kingdom have early game logistics power. Deal with it.
Another note, when playing the kingdom there is (was when i last checked) a second teleport spell you learn that says it teleports your caster and army (if one) to your territory. Oddly, this is also what the basic teleport spell does, makes me wonder if basic kingdom teleport is only supposed to port your sov, without his army. [stax77 beat me to this]
kadrasar
PS: I like Dagwood's ideas on non-territory teleporting and teleport range (but only as it applies to non-territory porting).