in the issue subject :

Custom, not customer

Sorry

This is included in the latest SVN code, it should also be in 1.2.0a1. Please test it and let us know if it satisfies your requirements.

I have downloaded the 1.2.01a version

1- In Manage Columns: I have no button to apply changes to the current project chosen from projects com box. i can only apply the action to all projects using "Update columns as global default for all projects" button. but when you press it the action only applied to the selected project from the comb box

2- Although Category_id is a default column, when you press the apply action button always shows this error :

APPLICATION ERROR #2601
Field 'view_issues' contains invalid field 'category_id'

Please use the "Back" button in your web browser to return to the previous page. There you can correct whatever problems were identified in this error or select another action. You can also click an option from the menu bar to go directly to a new section.

If you removed it from 'View Issues' you will have the same error message but with the next section ... etc. until you remove all category_id then the operation will be applied successfully

3- I've added a custom filed named test and linked it to proj1. but i can't add it to any view using manage columns. i have tried to add 'custom_test' to the view issues column field. but failed.
i can only add it as previous version to all projects issues view but add this to the config_inc.php:
$g_view_issues_page_columns = array ( 'selection', 'edit', 'priority', 'id', 'sponsorship_total', 'bugnotes_count', 'attachment', 'category', 'severity', 'status', 'last_updated', 'summary', 'custom_test');

This is available with 1.2.x.