Linear pattern with variables variable fenc

I have a sheet metal part that I can alter the length of using a configuration, along the part I have a set of holes that repeat a given distance set in the linear pattern. I would like to set a variable to change the number of instances but it doesn't seem possible to assign a variable to the number of instances as it's…

I would like to repeat the "speed bump" shape along a curved surface. Is there any way I can do that? When I use linear pattern with only appears to be able to do it along a straight plane.