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Pumping more air into the air intake system will, to a point, automatically add more fuel. The ECM will notice the extra air flow and compensate. At some point the system runs out of head room though. Either the ECM cannot adjust that much out of normal range, or the injectors go full-on and can't give any more fuel.
The real problem with the electric supercharger is the amount of power it takes to move and compress that much air. Say you want 8psi of boost, you'd need to move 3.3L of air every two engine revolutions into a 2.2L engine. Have any idea how hard that is? Have any idea what size electric motor you would need to generate that much power? Now you have an extra load on your alternator in order to supply that much power, which becomes a load on the engine as a result.
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