If you reaaally want to change the dimension style, you could do it in SketchUp:
create a dynamic component with your custom endpoint and a dimension line without endpoints
scale the dynamic component in 1 direction - the value of the dimension will update accordingly
copy and repeat
If your endpoint is just a perpendicular line, scaling won't affect it and it will look ok. If your endpoint is anything else, scaling will affect it and it will look messy. If you are into Ruby, you could make a nice plugin out of it that will rescale the endpoints accordingly to look 'normal' again though.
dimComponent.skp