You can use a standard sized servo.
Regardless if you "run a stumpy 2s battery and a micro receiver" or not, it's going to be "a bit of a squeeze" due to the inline nature of the 22 layout. Using saddle packs will gain you a little additional space to mount your electronics on the chassis, but using standard electronics there's plenty of room to mount your rx behind the servo, and then mount your esc on the tranny brace behind the battery.
Attempting to use a low profile servo is only going to get you a few millimeters of extra space, and most people (unless their driving skills are stellar), including us mere mortals, have found that a standard servo is necessary to stand the rigors of off-road racing.
But it's a little counter productive, and counter intuitive, to try and get away with using a low profile servo while relying on a "full size rx."
But to further answer your question - yes, you can use a standard sized servo. Lots of us do, and have done so in the 2 years since the car came out.
Will you have to be a bit creative with the electronics installation due to the confined nature of it being mid motored? Sure - because without the sidepod areas many cars have, that have mounting areas on either side of the battery, it can be a bit cramped. But if you go through any of the picture threads here on the forum you can find numerous examples of what people have done.
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