Improving the properties for activities
The properties of the symbols for activities 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 "Activity") for the activities symbols:

Remarks:
The green marked amplifiers correspond to the specifications according to 2525d. However, the unmarked amplifiers appear to be useful or necessary.
Unique Designation is not listed in the list of amplifiers for activities symbols in 2525d, but this amplifier makes sense here and is in the overview of the amplifiers for activities symbols (table VII, page 23) in 2525d.
My suggestion would be to include this amplifier in the properties and map them on the map accordingly.
In table VII, page 23 also the amplifiers echelon, task force indicator, reinforced or reduced, combat effectiveness, IFF/SIF/AIS, direction of movement, altidude, speed, special C2 HQ, feind/dummy indicator, installations, operational condition are listed to use it for activities symbols.
This only makes sense for some activities symbols. In my opinion, these symbols should be represented by the propterties of the units.
The assignment, which activites symbols would be "affected" by this, has to be done separately. Such an implementation would support the user in that way, that unnecessary input and thus errors can be avoided.
The Icon "Change Symbol Type" is used to change the "basic symbol" within the activities symbols without the user having to create a new symbol and thus discard the previous entries.
Note that the function change symbol type is only possible for activites that use the same property set.
Those activites symbols that are assigned to the property set "Unit" cannot be selected here and would have to be created new by the user.
The amplifier "Offset location indicator" must be enabled when the symbol is displayed on the map:
