I never really liked the idea of every mage having PWS available to them. I feel like you can't just go change it now, especially since A. Some mages have it and B. Some mages rolled specific robes in order to get it. I really like the idea of three different 'power word' spells.
Power word shield - I like the idea of area spell absorption or damage reduction, maybe a group haste similar to bolster that can only be casted once every 15 rounds?
Power word force - area force missile with all the perks of force missile - explode/bash ect
Power word cripple - This sounds like a lot of the spells black robes have now that no one uses Chaos, Devastation, Mass Hysteria.
White robes are the group buffer/defensive mages, they already have an area cleanse and can transfer spells to their group mates. Perhaps a group wide haste with a cooldown, maybe something similar to acid mist but with fire or arcane damage and has a chance to resist being gusted away. Or the ability to disable disabling affects for a short time, immune to stun/group mindshield.
Red robes are the utility class, they locate the best, have a lot of things to do with mobility ect but they lack in the AoE department that Blacks and Whites have. I think something with an area force missile or area force bolt would be pretty cool if it ha the chance to explode from each one for more area damage or to bash the targets like FB/FM do.
Black robes are the offensive mages, they excel at dealing area damage and disruption on the battlefield. The black robes mages are tough to balance, they have great single target spells in pain, constrict heart, energy drain and rend. Perhaps their new spell could lower the resistances of targets or allow their spells to bypass resistances. Ever try to tent a group of NPP mobs? Or fight a pair of NPP mobs that aren't 'human' so you can't rend/pain them? it's awful.
These are just off the top of my head, I think there is plenty of room to improve on these spells. I think adding PWS to every mage was perhaps a little over the top but with lack of coders, you did what you could with the resources you had.
I look forward to reading other suggestions.