I asked Spektrum if I could get this unit with BOTH sticks self centering. Here is their response:

Les,

Hello and thank you for your question. Yes we can modify the sticks
on the DX6 radio to have both centering. There is no charge for doing
this, all you have to do is ask when you are ordering to have the radio
sent to service for modification. Hope this helps, and have a great day.

Thank you,
Dennis Davenport
Horizon Hobby Consumer Sales
800-338-4639

So, for those of us tankers and boaters, you can have your cake AND eat it too.