Turning off SEFU - how best to minimise impact

Hi everyone!

I am in the process of upgrading all my Zen cart sites from 1.2.6 to 1.3.7 (yeah! I know i should have done it earlier but it was easier just to put it off!)

Anyway - I have worked my way through the new CSS and have got in near as damn it to the originals - so my attention is moving to installing the contribs that I have previously.

So far I have added the 3 column layout which was no problem, as was the Quickupdate and Sales reports contribs (thx to Frank & Paul for those)

After finding out that Google has change it views Dynamic URL's I am considering disabling the SEFU contrib on the upgraded sites.

Rather than just jump straight, in as is my usual method, I thought I would throw this one out to see if anyone has any experience with how best to achieve this without disrupting the Search engine rankings too much.

Any input would be appreciated :D

Cheers
Brinley