You can move the base attachment point by changing where it’s mounted. Extending the ram is complicated.
The ram must be connected with the steering arm or quadrant at a 90-degree angle at midpoint of the ram’s travel when the rudder is aligned to boat centerline.
You need to do the calculations to determine if what you’re considering is right for your boat. If you extend the ram and it is no longer at 90-degrees to the rudder post at midpoint of travel it will not be able to steer to one side as much as to the other. If you change the radius from the attachment point of the ram to the rudder post it will also change the steering limits - make the radius longer and the steering limits (in degrees) will decrease, or make it shorter and it will increase.
Also, consider the max force of the ram can probably approach 1000 pounds, so whatever you do must be sturdy. Consult the installation manual for your ram.