Flaps 2 was in normal use for Classics before year 2000. We used to work down through each flap position as follows:
Weight below 53,070kg
Clean 210
F1 190
F2 180
F5 170
F10 160
F15 150
F25 140
F30/40 Vref+5
The flap-speed schedule for positions 1 to 10 was increased in 2000 following the data about the crossover speed arising from the possible rudder related crashes (see
http://www.b737.org.uk/rudder.htm for details). This made the flap 2 position redundant.
It is possible that we may return to the old flap-speed schedule (and hence use flap 2 again) after all aircraft have had the RSEP modification but I doubt it will happen.
S&L