Can an URL shortener pass parameters?

I use bit.ly to shorten my urls, but parameters are not passed.

I use bit.ly/MYiPhoneApps which redirects (let's say) to iphone.pp-p.net/default.aspx.

Now when I try bit.ly/MYiPhoneApps?param=xx this param is not added to the resulting url.

I know I could create an extra "short url" including a paramter - so bit.ly/WithParam would result in www.example.com/somepath/apage.aspx?Par1=yy and so forth.

But what I want is to have a short URL directing to a page - and then I want to add a parameter to this shortened url - which should (of course) land at my page.

Is this a shortcome of bit.ly (and others are maybe able to do it) - or does "parameter forwarding" not work with 301 redirections?