More spell options - Light/alignment spells over fourth level for divines, more acid spells for arcanes, more poison spells for blightcaster, Rend the Soul added for neg focused clerics.
How about taking illusion from the half-time show to center stage by at least throwing in Shadow Conjuration, Shadow Evocation, Greater Shadow Conjuration, and Greater Shadow Evocation? Shades would a lot more iffy because the only valid options for it in DDO are Black Dragon Bolt and Incendiary Cloud for the most part. Because I have a feeling the developers really don't want to mess with opening a Pandora's Box of nested teleportation spell selectors.
Yes the spells are a bit "fiddly" as written but realistically they could be massaged in with a simple will save for half or pass/fail depending on which effect is being chosen. However they could open the door for getting damage out of Illusion DCs when Phantasmal Killer is not a viable option.
Shadow Conjuration (4th): Selectors for will save versions of Acid Blast, Glitterdust, and Web.
Shadow Evocation (5th): Selectors for will save versions of Fireball, Lightning Bolt, and Shout.
Greater Shadow Conjuration (7th): Will save versions of Acid Rain and Cloudkill. Acid Cloud could technically fit as well, but barring a rework the other two are better options.
Greater Shadow Evocation (8th): Will save versions of instant Delayed Blast Fireball, Chain Lightning, and Otiluke's Freezing Sphere.