The term "Linear Actuator" is a little vague... there are many types of linear actuators. All the term means is that it's something that creates motion in a straight line. It's something teams do quite frequently with cams or winches. Most commonly available linear actuators are really just motors connected to a lead screw... they would require some disassembly and replacement of the motor, but could be made to work.
I would guess, however, that you're thinking more along the lines of an electric solenoid actuator, which have been legal for a couple of years.
Quote:
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Electrical solenoid actuators, no greater than 1 in. stroke and rated electrical input power no greater than 10 watts (W) continuous duty at 12 volts (VDC)
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If you had a specific product to link to, you could probably get better discussion over what you want to discuss.