After I was looking for something that you, Santa Claus could bring so late, i have searched my hard drive and found the Remote control lock plugin.
This is a small extension to the web interface with which you can lock and unlock the remote control /.
Just install it and look at the extras in the web interface or with ip.der.dream.box / browser RCLOCK them directly.
To install the ipk to / tmp and FTPen with opkg install / tmp/enigma2-plugin-extensions-rclock * install. Ipk enigma2 and restart so that it also shows up in the web interface. With opkg remove enigma2-plugin-extensions-RCLOCK can get rid of it again.
And yes, the Plugin goes well with OE 1.6, so even with 2.0, is only half a page code.