I had the very same idea, and I don't think it would be a problem if you had a method to control the injection. My plan was to use the staged injector setup of Megasquirt to control it as extra fuel. With the ability to control injector duty cycles, there shouldn't be a problem with injector sizing as long as it's reasonable.
The problem, however, with using them for a meth system is corrosion. As far as I know, the whole system that you use for the meth injection has to be designed for alcohol (ie, you can't just use normal injectors, you'd have to get injectors designed for alcohol). Otherwise you'd probably encounter problems with corrosion.
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