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Did the AT10 have featherable props? If not, was level flight
maintainable with a windmilliing prop?

Well, after checking out the FAA Type Certificate Data Sheets
for the WW2 era light twins (Cessna T-50 (UC-78). Beech 18
(F-2, C-45, AT-7 and AT-11) and the Beech AT-10 (Not the same
as a Beech 18), none of them had feathering props. They all
had Hamilton Standard 2D30 prop hubs, which were a 2-blade hub
with a 15 degree pitch range.

Whether an airplane could maintain altitude on 1 engine would
depend on a number of factors, such as, well, what altitude
you want to maintain. Most of these airplanes used some
flavor of the Pratt & Whitney R985, the Wright R975, the
Lycoming R680, or the Jacobs R755. Full-feathering props
for these engines didn't appear until after the war.

--
Pete Stickney