i understand why you want to reduce the spool up times, and the alky kindof makes sence to me, but i'd have to say there are much better ways of doing that.
make sure your headers are in good shape, a crack will really hurt your spool up, just look at my 60' times i'm still only hoping to get 2.3's with the new turbo untill i get my cracked header fixed.
gut the cat, or put in a test pipe, huge difference you can feel. maybe go with a 3" terry houstom or art downpipe, or maybe just a ported stock elbow with a 3" pipe.
pump the exhaust, or get a nice free flowing exhaust. 2.5" dual or 3" straight will work. be sure the mufflers are 100% free flowing, it will help a bunch.
higher stall torque converter, i don't know what your setup is so i couldn't make any sugestions on how high to go. i'm looking to go 3000-3200 as soon as i can afford it.
duttweiler neck on the intercoler, or a more effecient inter cooler, don't expect huge improvements here but it will help.
Quick spool boost controller, i'd say its a must have. really makes adjusting boost simple, no more playing with e-clips and hot a hit wastegate arm, and its hard to get high boost with the stock wastegate anyways. you turn a screw by hand, to adjust the boost, and it spools up quicker. i'd never have a turbo car without one.
if that there doesn't all but eleminate your spool up time then look into the complicated and potentally dangerous (to the turbo) alky setup or propane, or just go with nitrous to get you going.