RSS max item showen

Is there a way to let the user fill in the max of rss items that are showen?

Something like this:

https://www.agrifirm.com/agrifirm-plant/nieuws-zoe...maxitems=5

Rss link like it is now:

http://www.agrifirm.com/DesktopModules/XModPro/Fee...

Code:

<xmod:Feed ContentType="text/xml">

<ListDataSource CommandText="XXX Database Query removed" />

<headerTemplate><?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
<channel>
<title>TTN</title>
https://www.agrifirm.com</link>
<description>test</description>
</headerTemplate>

<itemTemplate>
<item>
<title>[[kop]]</title>
https://www.agrifirm.com/agrifirm-plant/teelttechn...
<description><![CDATA[ [[kort]] ]]></description>
"> http://api.mailplus.nl/rss/mailplus/"><![CDATA[htt...
</mailplus:image>


<category>[[mail]]</category>
</item>
</itemTemplate>

<footerTemplate>
</channel>
</rss>
</footerTemplate>

</xmod:Feed>