Redmine

We defined some custom fields into the issues.
One is a info for requirement documents for our developpers.
We enter the path and filename of the documents there becauser we handle these documents inside a svn repo.
Actually there is no way to link them and to make it easy for our developers. If using wiki sintax (including the conrtol panel iwth the buttons like in the comment field) would be possible to be enabled optionally this would save much time for us.

Is there a possibility to make custom text areas in the issue tracker formatable with your editor like the documents text area uses it?