While I agree it seems really handy, I suspect it is too problematic.

• What if the 8829 is from a secondary, non-homesteaded home?
• What would it do if you use the Simplified Method for the home office?
• What if the taxpayer moved and there is more than one 8829?
• What if there are multiple offices in a home, each with different square footage?
• What if a room was also rented ... the M1PR wouldn't pick up on that.

Even if a tax professional were to review these items and correct things, ProSeries is based on the same programming as TurboTax, and the DIY-ers using TurboTax wouldn't know to correct wrong numbers that flow.