Dear Frostieck, we got refer to you from below osclass forum, I've bought your seo all in one plugin
want to ask how can we remove the _item id as per below mail?
If it need to be customise we will engage your service please let us know can it be done and how much?

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other then those perimeters, that is all osclass can do for SEO in the links. if you are programmer you can dig into the core,
or you can try/ask about frostieck SEO plugin (paid, but worth it)
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http://forums.osclass.org/general-help/how-to-remove-ad-id-in-'-custom-prema-link-'/

@elite1290
You cannot, and it is not related to SEO Plugin as this does not change anything with urls.