I know of no way to modify the origin, and have not heard of any having been added in 2014.
these issues are usually solved 1 of two ways;
1. use the move/copy body feature to move the imported body to the origin (this includes rotation)
2. some export formats let you select a coordinate system to use as the origin for the export, so you can create a coordinate system where ever makes sense for the part.
If you do a search in the forums you will see this has been an on going issue for some time.
What Jeremy suggested is probably your best bet for now or look at these threads that offer other thoughts that you might want to consider.