improving the properties of the control measure symbols (line - target)
The properties of the symbols for control measure symbols for line (target) objects should be improved, since not all amplifiers can be filled in according to 2525c or 2525d:

Proposal for the content and structure of the property window (named "CM - Line (Target)" for control measure area symbols:

Remarks:
The green marked amplifiers correspond to the specifications according to 2525d. However, the unmarked amplifiers appear to be useful or necessary.
Additional Information, Date-Time-Group and Altitude are not listed in the list of amplifiers for line target symbols in 2525d, but these ampflifiers make sense here and are in the overview of the amplifiers for point symbols (Table H-II, page 390) in 2525d.
My suggestion would be to include this amplifier in the properties and map them on the map accordingly.
The symbol icon (field "A") is already defined when the basic symbol is selected.
The Icon "Change Symbol Type" is used to change the "basic symbol" within the control measure line (target) symbols without the user having to create a new symbol and thus discard the previous entries.