I wish that soon InDesign CS6 Interactive Form Fields will include the COMB field for entering data in various formats such as phone numbers, credit card numbers, using some sort of format like [number of characters] ["(nnn) nnn-nnnn"]. I use comb fields a lot. Likely others do too. I realize that we are at v1.0 in the InDesign Interactive fields, so I hope that the developers will consider this for the next release!
I long for the power that Acrobat fields have to be implimented in InDesign.