Just dragged out my old FCOM and yes your correct, Idle Rev until nose gear compression
The reverser interlock on engines 1 and 3 is a physical
stop that prohibits further lever movement until the
reverser is safely deployed. For GE, when the reverser
is 60 percent deployed, the ECU removes the interlock,
allowing uninhibited movement of the thrust
levers. For P&W, when the reverser is 87 percent deployed,
the EEC removes the interlock, allowing uninhibited
movement of the thrust levers.
Reverser lever 2 does not have a physical interlock.
The ECU or EEC, however, prohibits thrust increase
beyond idle power on engine 2 until the nose wheel
ground sensing switch has closed and the reverser is
more than 90 percent deployed.