Is it possible to bind a value to a Map (which is directly on the request, and not on a backing object)?

I have implemented the code from this JIRA, and am able to access values from that map.

However, if I attempt to bind to a value in this map, I receive the following stacktrace:

Code:
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'flashScope' available as request attribute
at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:141)
at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:720)bean name 'flashScope' available as request attribute...
Note, I am using velocity, so my bind statement is as follows:
Code:
#springBind("flashScope['someValueIPlacedOnFS'])
I'm able to print out values from items I place on FlashScope, I just can't use the short cuts (i.e. #springFormInput and the other macros included for velocity usage).