I've seen the old thread below, it seems Direction/Motion Blur might have "trans" parameter in some version.
With "trans", the character not only have direction blur, but shows some serial "shadows" behind.
Is the "trans" parameter a todo work, or I misunderstood something?
The 'trans' option was a transparency param I used for testing (I think).
If you any extra param's adding let me know and I will try to add them?
Go to the above link for a an additional 'Motion blur' effect.