TMSH VS create vs GUI VS create

First off, when you create a VS via CLI, those two options you have identified are usually "disabled", which is usually not what you want, so it is advisable to modify those back to "enabled". -- Perhaps this is a poor default behaviour that should be changed... if you feel like it's worth it, request an RFE via the normal channels.

When you do create the VS via the GUI, those values are at their default value when undefined (which is "enabled"). That is why they are not present.

If you toggle any one of them, they magically become part of your configuration.

In summary, some configuration lines appear in your config files only after they have been modified from their defaults. Creating a VS via TMSH toggles "translate-address" and "translate-port" from their default values.

Their presence should not bother you so much as whether or not they have the "correct" value.