Let's be honest here. EVERY version of gate described here is a Limit Break in one way or another. But on a theoretical level they don't break the Limit, they get around it.
The reason I went for the relatively slow value of 5c was something of a limiter on the spacegate system. Being MOSTLY outside normal spacetime would reduce the affects of gravity (depending on your theories of Gravity) and thus allow 'waved drives the ability to go faster. However, the unusual nature of the spacetime on the other side of the spacegate restricts the speed to 5c max. And because you can't interact with normal spacetime it leaves you trapped if you can't get through another spacegate (so even without the limit I imposed, IF you made it outside the Limit and accelerated like normal it wouldn't be useful).
The reason I went for the relatively slow value of 5c was something of a limiter on the spacegate system. Being MOSTLY outside normal spacetime would reduce the affects of gravity (depending on your theories of Gravity) and thus allow 'waved drives the ability to go faster. However, the unusual nature of the spacetime on the other side of the spacegate restricts the speed to 5c max. And because you can't interact with normal spacetime it leaves you trapped if you can't get through another spacegate (so even without the limit I imposed, IF you made it outside the Limit and accelerated like normal it wouldn't be useful).