For security reasons, we don't have any front-end edit functionality available on our site.
I've had a look at changing the sef extension, but I can't test it because there is no front-end editing allowed. Therefore, it's very difficult to add this functionality.
I may have to therefore state that this free SEF extension does not cover front-end editing.
If you, or someone else would like to add that to the extension, that would be great. But, as it is, I'm simply too busy and don't have the time to work on this at the moment,
with apologies,
David.
P.S If the chance does arise, I will look into it in the future.