Of course Perl can seemlessly access all the functionality of OGo provided by the shell tools. In addition Perl supports XML-RPC very well and OGo provides examples for that.
As a matter of fact its simple to integrate existing Perl based dynamic webpages into OGo WebUI.

We discovered an old demonstration for using Perl CGI scripts to access the OpenGroupware.org XML-RPC server: ogo-cgi. This should be a good starting point for Perl developers.
Also available is an old document containing instructions for installing a Perl XML-RPC client.