Well, you'd want to send to Xelgad, not Rothgar, since Xelgad is the mechanics dev.
I feel the crit multipler change won't happen - coercer damage is about where it should be (behind sorcerer, but not by a vast degree), it's just illusionist damage that's much lower by comparison. I don't think they'd change the crit mult for one of the enchanters but not the other, since it'd be a little jarring. Also in solo and heroic aspects we're pretty much fine, it's just that in raids we've found ourselves particularly weak.
The thing we need to emphasize is that while our utility is still relatively in demand in raid settings, our contribution will diminish with time and gearing as players begin to cap all the relevant stats we increase, so our damage needs to remain competitive both to make our class entertaining to play and to make us competitive for raid spots with other utility classes. I feel the best solution for illusionist woes is to upgrade our red slots, similar to the ideas you post there.
1. Suggesting this change to prismatic chaos, while reasonable, probably won't happen because of how similar to Despotic Mind it'd be then. Prismatic Chaos is almost uniquely vulnerable in terms of targetting because of needing specifically a strong melee scout to cast it on who will use up all of its triggers before the recast comes up, so it can be much more easily disrupted than despotic, much less Hostage or Spell Lash. I'd rather not give it even more triggers because of that (when we could get 7 triggers on prismatic it was all too common that scouts wouldn't use up all the triggers even if something as mild as a knockback happened), I'd rather see the red adorn just increase its base damage by 40% or so.
2. Won't happen, unfortunately. Coercers do too much compared to us and they won't give us a different multiplier than them.
3. Good idea for an adorn, though I feel some of our other adorns need to be combined to make room for it. In particular, the two synergism adorns should be combined. The peace of mind adorn should be made coercer only and our destructive rampage adorn should do both rampage and peace of mind.
4. As I mentioned above, I'd rather see the red adorn add significant base damage to the ability than give it even more triggers - a 40% base damage increase is equivalent to going to 7 triggers from 5, though I imagine the number may be too large for them to consider it.
5. Yeah, the Flash of Brilliance adorn should definitely give either base damage, crit bonus, or both in values equivalent to Intellectual Remedy adornment.
6. Time Compression should definitely be self-castable, though spell double attack benefits us far less than most mages we cast it on. Still, it'd be nice to have the option of doing so rather than be stuck putting it on, say, a bard.