Is there away to keep planes from using the displaced threshold? I got Blueprints KSDF and 35L has a 500ft overrun and a 1040ft displaced thres. the taxiway is where the numbers are. And when a plane gets cleared to t/o they go to the end of the threshold to take off. This takes time away between take offs and especially when UPS is busy. I just want them to taxi onto the runway and t/o.

Easy. Delete the taxiway and runway links north of the Taxiway B intersection so that the node that connects B with Rwy 17R/35L is the one that is northernmost.

As Kevin noted - get rid of the runway link and the AI aircraft won't go there.The 'magic number' for distance from the taxiway connection to the end of the runway links appears to be 1,000 ft from all the testing I've done.Shorter distances AI aircraft usually don't back-taxi. Longer they do back-taxi.