David, You might want to look into Dennis Brown's Flexible Parameters.
He has built quite a nice interface that is relatively easy to use. Like all thigs, your mileage may vary, but check it out and see if it fits your needs. I think it can be found in the user KB, and possibly in the files. I know he is working on a "soon" to be released updated version, but I am using 4.2 and it works fine for what I need. Blair
