I had a customer request to set the default home page refresh interval to 2
minutes for all users. I found several suggestions that essentially involved
modifying the code (e.g. by creating a local version of Elements/Login or
Elements/Refresh), but wanted to avoid code customisations if at all possible.
I found that I could make this work using mod_rewrite, without having to touch
the RT code:
RewriteRule ^/$ /?HomeRefreshInterval=120 [L,PT,QSA]
(note that this is with RT in the root directory of a virtual host; modify the
"^/$" portion as necessary for other locations).
Posting this message for the record, to save someone else the time it took me
to figure this out.