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Can I replace on the DS-12 the potentiometers at positions 5 and 6 with the switches?

Yes, of course it's possible. For exchange you need your preferred switch for DS transmitters (switches designated for DC transmitter are not compatible) , nut DS-top and mounting key.
DS-12: How to establish the Trainer function over PPM Jack cable.

Since DS-12 doesn't offer the wireless trainer function, you can still use the teacher-student system between two transmitters over the PPM signal wire. You need just a single audio 3.5mm Jack-Jack cable (mono or stereo).
DC/DS Firmware Update Version 5.03

Download the latest software update for the DC/DS-24, DC/DS-16, DC/DS-14 and DS-12 transmitters. This update brings many requested features based on user feedback. You can find more information in the text.
Lua Programming API for DC/DS-24
The DC/DS-24 and DS-12 transmitter line brings new possibilities and enhancements of individual user programming due to Lua extension language. The capabilities of the transmitter become almost unlimited and it is only up to the user´s imagination what can be done with the transmitter.
The attached document contains all necessary information for succesful development using the Lua programming language.