Adding another vote for this feature.
Actually we need to use it in a different way. We’re using MSM on http://www.herecomestheguide.com and http://myguide.herecomestheguide.com. The Simple Search form is used in the header template, which is shared by both sites. There isn’t really anything to search in the MyGuide site and because the header template is embedded in both the WWW and the MyGuide “site”, the search form, when in MyGuide, would only search the MyGuide site.
So I took the rendered source of the simple_form and copied it back into the shared header template (replacing the simple_form tag and code). Even though you can’t specify the parameter site=“site1|site2|etc” there is a “site_id” created in a hidden field when you use the simple_form tag. So specifying the WWW (site_id = 1) in the hardcoded search, along with the correct FORM ACTION now allows the search to work in the MyGuide site (site_id = 3).
This won’t do what everyone is asking in this thread. But for those that want to search a different site from the site they’re currently in, this is a hack until the “site” parameter works in the simple_form tag.
