You can do this on a per-site basis by adding the following
to your main.cfg file:

cgiarg shortname=t argdefault=0

You can't, unfortunately, change the default only for a
specific collection (unless you hack the macro files in some
way).

Stefan.

Jared Potter wrote:
> Hello, I'm wondering if there are any settings in the
> collect.cfg that can let you set the default for the
> "some" or "all" option? I know that you can set the
> default index. Am I going to have to change the macro
> file for the search page?
>
> Thanks,
> Jared Potter
> Systems Administrator
> Mercy Corps
> www.mercycorps.org
>
>
>