When working on an assembly, it is necessary to move components around. If one then tries to create a joint, a window pops up informing the user that "Some components have been moved" (by the user, presumably, on purpose); this window has a default option of "Continue", which moves everything back to where it had been (possibly out of view); the other option is "Capture Position", which allows the user to begin creating the joint from where he has put the components. Making "Capture Position" the default seems (to me) like what the user would expect and want. It probably won't save a lot of time once one figures out the work flow, unless one unthinkingly hits Return and loses his components...