2 new types of rails to improve minecarts without breaking peoples machines

how about 2 new rails for the minecart
first of all, it would keep powered rails and normal rails the same... unless
it were to drive on an "high speed rail", this rail would change the state of the minecart to high speed state, activating what is now essentially the experimental minecarts function.

then to make it behave normally again youd have a low speed limiter rail. 
this would turn the state of the minecart back to how it normally behaves, this could allow for fast travel between bases while collecting in farms would also still work. this way we can have non broken farms, faster minecarts, but also normal speed minecarts for those who prefer that.