As crazy as it sounds, the build is a little tight on skill points if you want full trapping plus max ranks in concentration, spellcraft and heal. Human helps for this.
I'm unimpressed with the AM force SLAs for leveling. Give me a webby firewall any day.While leveling, (until you get really good Necro spells) Its better to go with AM with evocation (chain missile and magic missile).
Extend is most useful for death aura. It does work to drop extend for empower to focus on AM force SLAs, though.