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It certainly can be done. The reason it is not... you would have to retard the timing under load so far away from MBT it would kill the efficiency of the engine. With boost people are retarding timing as well, but making up for it with a massive increase in VE. Without boost, every degree of timing you drop away from MBT costs you a couple hp.
It would be a nice experiment to tune the same stock car on 87, 89, 91, 93.. though i think it would meed to be done on an engine dyno to really safely get the most out of the lower octane under all driving conditions.
Also of note, if you want to get an idea of what it might feel like, just ask your tuner to give you a stock map with the ignition advance table set to all zero's (setting IAM to zero will only work for about 10 minutes until IAM works back up to normal levels).
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