[cobalt-users] Automating Subdomains using Perl & DNS Refresh

["Cobalt List Account - Auzit.com" <cobalt@xxxxxxxxx>]

I read this article about a week ago ( 
http://list.cobalt.com/pipermail/cobalt-users/2001-
December/060888.html ) when searching for a method of adding user 
subdomains for a raq and was interested in whether this process could 
be automated using perl; If I were to simply edit the subdomains.conf
file, appending new subdomains to it upon an event e.g. user signup.

What I am unsure about though, is the part in the article about 
allowing ExecCGI.

"ExecCGI (classic CGI) for either the entire server (not secure)";
If I were to enable it for the entire server what security problems 
would I have. 

And secondly, the line...

"Restart httpd.conf" I know this needs to be done to to reset the 
domains but I was wondering if this could be left out and refreshed at 
a certain time or interval automatically, I've heard that raqs refresh 
the DNS after a certain time but I am not sure if this is true; 
otherwise if not would I be able to refresh using the perl module 
Schedule::At (http://search.cpan.org/author/JOSERODR/Schedule-At-
1.04/At.pm) to call the command at a specific time (The reason I want 
this is if I have say 10 users signup in an hour I don't want the DNS 
refreshing every 6 mins; instead I want it to store the requests and 
perform them all at once (i.e. every 2 hours).

If anyone can help me with the info I need; could you please reply.

James Austin