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Can you change built-in parameters from Type to Instance based, and vice versa?  This post shows you can. 

The essence of the workflow is to

• start a family with the desired template, 
• add a value to the parameter, 
• change the Family Category to something that doesn't have that parameter built-in, 
• switch the parameter to Instance, 
• then change the Family Category back to the original

Read the more detailed version here:
http://aectechtalk.wordpress.com/2013/12/26/change-revit-voltage-parameter-from-type-to-instance/

(It is based on changing voltage parameter to Instance based for Electrical Equipment)

Dieter Vermeulen describes an interesting workaround - when using a Family Type parameter, how can you turn "off" the family without using Visibility parameters?

His solution is essentially to delete geometry out of a copy of the Nested instance, and leave only one Type in that blank instance.  Call it None, and it shows up in the Family Types list that way.

Read the whole post:
http://revitbeyondbim.wordpress.com/2013/12/03/how-to-set-family-type-parameter-to-none/

via
https://twitter.com/RevitbeyondBIM/status/407975518768594945

Another nice workaround by Philip Chan - if you want to change one of Revit's built-in Type Parameters (derived from a Family Template, such as Door Fire Rating) to an Instance Parameter, you just have to take the Family on a little round trip to a more flexible Family Category.

For example:

1. New Door based on Door Family Template
2. Switch to Generic Model Type
3. Change built-in Type Parameter for Fire Rating to Instance
4. Switch back to Door Category

You can read Philip's whole post at:
Phil-osophy in BIM: Hacking System Parameters in Door Family