The standard reference for "pointer warping" for Tk has been the "usage FAQ" [http://www.hobbs.wservice.com/tcl/faqs/tk/tkfaq.html].
It briefly mentions that pointer warping is a bad idea, supplies source for an extension
which implements warping, and also points to [...], with its implementation of the same as ...  The FAQ doesn't seem to be current ...

As "[Changes in Tcl/Tk 8.3]" hints, release 8.3's [event] command builds in pointer warping.

Among the legitimate uses of pointer warping are test automations, including [Android], and for pedagogic purposes (Android can also
help build demonstrations).