stuck in the sand

[OTTO]

Hi to all,

             I've noticed that on a few 3rd party aircraft they won't taxi on the runways like the stock aircraft do.
       Seems like they're stuck in the sand & won't move (maybe they are)
       Is there anything that can be changed in the air or cfg file to help that ?
       One example is the FDG P-51 , it's a great plane & lands on the runway & rolls out fine , but once it stops it's over .
                                               
                                                              Just wonderd
                                                                OTTO