Friendly port / SH3 commander question

[MarshalLaw]

Hello all,

Question,
If you dock at another friendly port other than your home port, I know you can refuel, rearm , and battle damage is repaired, you also get a "null" as a new patrol grid. You can't give out medals, quals, etc, and cannot modify your boat or torpedo load out.

With SH3 commander can you change the "null" grid to a regular numbered grid?

If you have a destoryed system ( periscope, etc) is it replaced only in your home port or other friendly ports as well?

Can you request a transfer only in your Home port only?

Thanks in advance

BTW ( playing modified stock, no supermod)