And in case someone wonders why I'm asking..

In cases where I wanted to say "I gave to myself a present", since there is no prefix for "me-myself", I wrote {qunnoqvaD nob vInob}.

But if I want to say "we care only for us", and I want to write {maHvaD neH maSaH}, I stumble upon the fact that the concept of {-vaD} is already included in the {SaH}.

— in the chart notes subject-object combinations which cannot be expressed with the Klingon verb prefix system. For such meanings, suffixes (section 4.2.1) and/or pronouns (section 5.1) must be used. —TKD

There is no prefix for "me to myself," so use suffixes and/or prefixes.

jIHvaD nob vInob
I give a present to myself

Correction: suffixes and/or pronouns.

-- 
SuStel
http://trimboli.name