Hey guys,
it seems there is no possibility to lock "arm envelope"
http://forum.cockos.com/showthread.php?t=193180
Would be nice to have this possibility. Using automation read mode I like to see which parameters are already in use. Therefor I find it nice to have it "armed". Sometimes it happens that I lose that setting and the envelope changes to trim/read.
I think it could be easily implemented: double check an envelope "arm" box in the automation context menu to get a little lock icon instead of the check mark. Would be very nice to have this as a standard behaviour optional.