Each time you edit the ctx files they will need to be encrypted again and the srcds they are being modified for has to restart. You can also get by with using no encryption but you would have to make sure all the files are that way. Then simply edit the text file and restart the srcds for the changes to take affect. There was some work in the past to make the *.ctx files dynamic but it seems to have stopped in favour of getting SM 1.1. out as a final release..