Honestly, I'd rate IAs as higher than Standards, since they happen in addition to Standard actions. There aren't any examples in the PHB of Conjurations that consume players' IAs, so I would avoid any kind of At-Will abilities that consume player IAs.
Yeah I'd rate them higher too, but I was mainly thinking of a "what if" you could trade your IA for an action on your turn. I think it would be appropriate to have a hefty cost to do so.
I'm also thinking that IAs as At-Will Attacks (utility powers is fine as the rogue reveals) is probably too much and as pointed out already would cause a lot more trouble than they are worth.
I think it would be nifty to have some Encounter/Daily powers that allow your pet to take an IA, as long as the overall effect isn't more powerful that other IA powers. For example, a "Loyal Protector" power that uses the PCs IA to give the pet an attack against a creature that just damaged the PC.
That's exactly what I was thinking or even take the attack instead of you... like the succubus' ability
