Is it possible to have user editable custom fields in content. Our client would like to be able to add a static value to their newsletter eg. Issue No. Nov 2010. Ideally they would like to use tha standard Newsletter template we have created, but change the issue Number when they send it.
Sure no problem. You can simply add the template tag <$description$> to make that line editable, see http://help.campaignmonitor.com/topic.aspx?t=129#description