I think the controller project is a good one.

I would also point out that around 1998-1999 the factory PCM software for one year in the Ram locked up the TCC in 2nd gear, most probably as a slight MPG improvement.

However, there were so many additional customer complaints about 'jerkiness' during extra customer-felt TCC lockups that at least one flash came out so the dealerships could do away with this feature for customer satisfaction.

So... if you build a standalone 46RE controller you might be able to
HONESTLY advertise it
as a MPG improvement device for Ram and Dakota pickups, particularly for city driving.

I would also estimate that at least
15-30% of Ram/Dakota owners really dislike how their 46RE drops out of Overdrive gear on highway hills and makes a noisy shift down to 3rd.

These owners might like a box that instead would let the torque converter clutch slip while hill climbing in OD rather than totally down-shift to 3rd.

I notice that the trans controller software on later model (2005+) Chrysler mini-van automatic transmissions now do this on most highway grades less than 4%