Append Query String to IIS Rewrite Map

I have a ReWrite Map and I would like to append any query parameters in the requested URL to the rewritten URL.

For instance:

• /page/abc/ ---> /index.cfm?page=abc (works)
• /page/abc/?param1=111 ---> /index.cfm?page=abc&param1=111 (doesn't work)
• /page/abc/?param3=333&param4=444 ---> /index.cfm?page=abc&param3=333&param4=444 (doesn't work)

My web.config is:

[...]
<rules>
    <clear />
    <rule name="Rewrite rule1 for SiteMapEngine">
        <match url=".*" />
        <conditions>
            <add input="{SiteMapEngine:{REQUEST_URI}}" pattern="(.+)" />
        </conditions>
        <action type="Rewrite" url="{C:1}" appendQueryString="true" />
    </rule>
</rules>
[...]