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Part of knowing What Revit Wants, is also knowing what it Does Not want.  Sometimes, you can push the hack (or workaround) that step or two too far... and the result is unpredictable, buggy and kinda useless.

In the past, I have used various methods to create inplace or component families that are not 'officially' or natively available.  In this particular instance, I used the IFC round trip method to force the creation of an Inplace family with Category set to Rooms.  I also pushed this into a Component (loadable) family.

Great!  I have Room families.  But guess what?   The result is unpredictable, buggy and kinda useless.

In fact, if you open these projects, make some Room Separation lines and then try to place a Room, I would estimate that in 95% of cases, your Revit has already crashed.  The families will not accept a tag, and they won't schedule.  They seem to just sit there, destabilizing your Revit environment.  So why post about it?  Well, basically so that you can add this workaround to the aforementioned list of something that Revit (currently) does not want.

I have provided both 2013 and 2014 versions for your download and testing here:
RVTs that will crash Revit

Here is an easy way:

1. Install Case Add-in Manager
2. Using the Add-in Manager, install Batch Export Family RFA's tool (I am running v2012.11.13.0)
3. Open a Revit project and run the tool
4. After families have been exported, you will be presented with an error message that tells you which families are in-place (see below).

NOTE:  The Case exporter also creates folders for each Category as it exports.  Nice.

This was in response to:

@lukeyjohnson Meaning... do some kind of filter to determine which familes are in-place vs not
— Jason Rostar (@jrostar) December 6, 2012