Is it possible to specify a custom font for an individual database that is different than the default font for all databases? For example I want to use a different font for Rich Text documents in a particular database so to have an informal handwriting feel, at the moment I have to change the font every time I open a new document in the db, it would be good to make the font, (Lucida Handwriting) the default but only for this one db. Cheers.
No, the font settings apply to all databases.
However, you could create a template rich text document with your chosen font. Export it as a template, then when you wish to create a new rich text document with that font, select it via Data > New from Template.