No such devise exists as far as I know. vvt-i isn't so much about making power like v-tec and vvtL-i, it's more to smooth out the powerband and get good gas mileage.
It operates over the whole RPM range, so you can't get a "controller" to make it "kick in" earlier if that's what you were thinking.
there is a controller for vvt-i or vvti-L
but can only be found in a stand alone ecu such as a Motec M400 and apex-i vehicle specific power fc... The Motec M400 is a complete stand alone is nicely priced at $3000 to $4000 depending on where you go... Apex'i doesnt make a power fc for the corolla doesnt make one for the Celica 2zz-ge and a MR2 spyder... you could possibly re-wire your pin outs and re-plug your male plugs to accept the MR2 sypder ecu...