To Lemurian, posts 2391 and 2394.
A couple of technical inaccuracies in your posts.
If a reverser is de-activated, the sleeve will indeed not move. If however the associated thrust lever is pulled into reverse range, the engine WILL spool up to the slightly higher idle setting that belongs to reverse! The correction of +55 meters to required landing distance on contaminated runways is the result of the fact that the (extra) forward thrust of the engine must be taken into account, while the retarding effect of the (serviceable) reverser may not be accounted for.
If a reverser is de-activated and the associated thrust lever is pulled into reverse range, the amber REV indication will appear on ECAM, because there is a disagreement between commanded position and actual position of the sleeve. Also, ECAM caution REVERSER FAULT will be displayed indicating a failure of the (locked) reverser to perform as commanded.
During normal reverse use, amber REV indication is not the result of the movement of the sleeve, but of the temporary disagreement between commanded and actual sleeve positions.
General information.
Some time ago, people have requested EPR and / or N1 figures for full reverse.
EPR indication about 1.05, which is a low figure for the amount of thrust. However, during reverse thrust, EPR value is not representative of thrust level as it is during forward thrust.
N1 is 72,5%, which will be a lot more representative of the thrust level that the engine is producing.
EMIT.