The aircraft is required to be lined-up within the lineup allowance. The lineup allowance for our "Boeing" for a 90° turn on is very very tight, and hence for an intersection departure, many of us will "swing" towards the threshold a little to increase the radius of turn to the lined-up position and reduce stress on the gear and wear on the inboard tyres.
Quite frankly, runways with "indents", such as 21 at Perth (and 06 to a lesser extent - brand new taxiway too!
), are a nuisance because, if one is to comply with the rules, one has to do a quite tight turn to still get lined-up within the lineup allowance.
One solution is to use an RTOW chart for an intersection further down the runway. Then you don't have to worry about the lineup allowance. You can do a nice wide rolling turn and off you go!
I can assure you that in the event of a mishap on takeoff, you will be asked why you did not line up within the lineup allowance. Perhaps DJ 737 drivers are just preventing that scenario. You can argue with the lawyers all you like "But sir, there was plenty of runway!" "Was there Bloggs?". They'll have your guts for garters nevertheless!
Keg, what's the 90° lineup allowance in your machine?