There s no such parameters in 2.9, you could use the {rss} macro and display a confluence feed of recently updated content, but you would have to transmit a username and password inside the url, plus the resulting page will either simply display the list of page title (no space, no author nor date) or the complete diff/content for the page (a bit noisy).
A more practical way of limiting the number of results shownwould be to use the GET parameter maxRecentlyUpdatedPageCount which control the {recently-updated} macro behaviour.
In order to do that, you could use the {redirect} macro (it s in a free plugin) on your page. Supposing your page is located at http://confluence.example.come/display/SPACE/Page, its source will look like (for 50 recently update items) :
{recently-updated}
{redirect:location=http://confluence.example.come/display/SPACE/Page?redirect=false&maxRecentlyUpdatedPageCount=50}
Note that it will display a slightly annoying information panel, warning you about the redirect. If you want to get rid of it, get your hands on the {span} macro (free plugin as well), and change the markup of the page to :
{recently-updated}
{span:style=display:none;}
{redirect:location=http://confluence.example.come/display/SPACE/Page?redirect=false&maxRecentlyUpdatedPageCount=50}
{span}
