Get all posts in RSS

Codex has example snippet on how to use post_limits filter to override amount set in admin for feed.

if (isset ($query->query_vars['feed']) and ($query->query_vars['feed'] == 'ics')) 
    add_filter('post_limits','__return_empty_string');

http://codex.wordpress.org/Function_Reference/query_posts#Usage_Tips

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