Using mISDN trunk for outgoing calls using Asterisk GUI

Asterisk GUI (current version) does include the menu required for setting up the mISDN Trunks (“mISDN Config”). But how about using those. Currently that seems not to be supported by Asterisk GUI or did I miss something?

Whilst adding a new user extension I may select SIP, IAX and Analog “Technology”. “mISDN” is not an option that may be selected. Is the only way to use mISDN to make the required changes manually within the coresponding conf files? ARe there any plans to complete the GUI for mISDN? SHould I do that job myself (I hate doing things others are already working on)?