the suggestion in the title might not be the best solution though... here's what I'm trying to do:

I want to add a userform to an already existing pagetype, that already sits comfortably in my class hierarchy, so inheriting from UserDefinedForm is not ideal.

Any other way to put a user defined form on that page? Using DataObjectDecorator would mean rewriting UserDefinedForm or wrapping it in a DataObjectDecorator somehow...

thanks

Interesting thought, hadn't thought of making a decorator. UserDefinedForm.php does contain alot of custom code so not sure if you're going to run into issues round the form submission process but to be honest I think most of it should work fine as a decorator (Haven't tested decorators with forms).

Give it a go rewriting it as a decorator and let me know how far you get. Might be interested in seeing what issues you have and if they can resolved and redo the module core for it because you're quite correct - it would make the page type alot more flexible.