JIRA Issue Navigator: Allow "Text Search" in "Text" "Custom Fields"

JIRA has "Custom Fields", some of which can be "Text". It would be nice to be able to search them, as well as the "Summary", "Description", "Comments", and "Environment" fields, directly from the "Text Search" boxes on the Issue Navigators at http://jira.atlassian.com/secure/IssueNavigator.jspa and https://jira.ts.wikimedia.org/secure/IssueNavigator.jspa . Being able to do so would eliminate the need for hacks like the comment in https://jira.ts.wikimedia.org/browse/WIKISENSE-9 . Implementation could be as one checkbox for "All Custom Fields" that have "Text", or as checkboxes for each of the (currently 2 at Wikimedia) "Custom Fields" that have "Text" (the former scales better but the latter allows more granularity). See also my similar report at https://jira.ts.wikimedia.org/browse/TS-74 .