Redmine

hello all.
i have a problem (newest redmine version) while creating new issues.
i have set the "ticket category" to be a MUST on creating/editing/updating/...
It works, no problem..
But i do not want to have in all projects ticket categories!
And even if there is no ticket category in a project,
while creating a new ticket you will be stopped cause of "please select an ticket category".

So there has to be an additional check..

if ((TICKET_CATEGORY == IS_A_MUST) && (TICKET_CATEGORY_CNT > 0)) { .. }

i have never read/write Ruby ..
So it would take me 2-3 days to learn syntax, understand the redmine code and find the correct place to put my additional check..

I think so for any of you guys this should be maybe 5 minutes. :)

So please help me. =)