*NEVER option for PARM PMTCTL

When specify PARM of *CMD source, you can specify the PMTCTL keyword to enable conditional prompting of that PARM.
The current permissible values are: Name, *NONE and *PMTCTL
We would like to have an additional *NEVER (or any other name of your liking) to disable prompting of that PARM

I have 2 commands that are almost identical.
95% of the parameters are joined.
There are few parameters added to one command that are not needed in the other and vice versa.
I would like to have single CMD source code for both as well as 1 CPP code.
For the parameters that are extra for each command, they should not be able to prompt on the other command, although they still exist in the CMD code and be passed to the CPP.
Before compiling, we will copy the single source to another name, alter it a bit (by an automated program of course) and compile it in the 2 codes so I'll end up with 2 commands.
For example, we can alter a PARM at the top of the source that is CONSTANT(<utility name>) so the CPP will know which command it serves now.

But it looks like there is no way to "hide" the unwanted PARM's in one command while showing the wanted, and vice versa on the other command.
The PMTCTL just wouldn't allow us to use a PARM that defined as CONSTANT to be used for PMTCTL CTL.

If we will have a PMTCTL(*NEVER) in the PARM, or alternatively PMTCTL CTL(*NEVER), we can alter the source code that we copy and switch between the wanted PMTCTL(*NONE or *NEVER).
If the PMTCTL command is modified (rather than the PARM command), than maybe CTL can be *NEVER and *ALWAYS to make it easier switching.