The whole point of a pump is the mechanical primitive feeling of pumping the thing. Also the fact that it fires from a closed bolt. Your idea would be open bolt. An external electronic pump would either add bulk and weight limiting the effectiveness of the marker in semi, albiet it would be faster and smoother than the equivalent mech pump, or in the case of a "pump" button/lever/trigger render the marker so fast to operate is there any point in it being a pump at all? It's an interesting idea, just not for me. Stock class or nothing