"True delete" can be replaced by enabling the respective setting on the "Features" page in the "&xwp; Setup" object. This is also initially disabled.
Compared to the WPS's delete operations, &xwp;'s "true delete" has a number of advantages. For one, you get a proper progress bar which shows you the progress of the delete operation. Secondly, when you delete a folder with many sub-objects, you finally get a change to cancel deletion, which isn't possible with the WPS. I've had this a number of times... pressing the "Delete" key over a folder by accident, and 100 MB of files got deleted, with no chance to interrupt. Not a good idea.
If "true delete" is replaced, the following actions will be taken over by &xwp;:
This will however affect "true delete" from a context menu (if you hold down the "Shift" key while clicking on a "Delete" context menu item) and the "Destroy object" and "Empty trashcan" commands in the trash can itself.