I always thought reversers were a no-no on a reject.

Can't get credit for reverse thrust on takeoff performance calculations but the drill (ours anyways) is max reverse, max brake ....
Then if no reverse thrust is available to an engine the FO calls out NO REVERSE ON #1 (2)

Oh, that's it. I guess assymmetric thrust isn't a huge deal on that aircraft.

Pie,

As Delta hotel said, "field length" calculations do not take reverse thrust into consideration, they also state "average pilot reaction time" in order to initiate the reject.

I've landed several times with 1 of the reverse systems inop (ours are hydraulically controlled in the E170/190). It doesn't have that much adverse yaw. A little bit of rudder is needed, but not as much as say a V1 cut.

Rolls Royce baby. Gotta love 'em.