Thanks for the opinions and comments.
NA5HTG, I have in the past tried the official route but it was probably to trivial to take further.
D69 your point echoes the official line I have had come back at me but regardless, its human nature that you'll get crew who see the full length available and will want it. There's nothing wrong with both of these viewpoints and all I'm asking is : if flight crew want the full length then please ask Ground as they have jurisdiction ( and I appreciate that asking Ground is not always possible if you've been switched to Tower ).
I know this is not rocket science but Ground should clear traffic to J1 or J9 for one of three reasons, i) they specifically want you to go there or ii) they're a Ground god, take-off data is computed for J1 and J9 and everyone else is an idiot or iii) they've never given it a second thought. By soliciting your comments I'm trying to address the latter.