Add custom percussion instrument - best practices?

Thanks!

Is this way possible add others? and i think if i dont want do this ican use other instrments in my percussion map what only relabel (i mean stuff what shows in stave) new way.

i feel editign itself these files its not my thing. even i think understand content of file called: congas-names.xml. how i know what i put if develop other this other file. what its meaning in fuction? if i need add others.
i imagined all techniques can marked any instrument for pizz. for triangle of course is not possible.
btw what is good free xml editor in windows? i mean what supports colouring becouse otherways i can use notepad i think. but colouring makes thing easier.

Unfortunately, Dorico doesn’t have an instrument editor (yet). In general, editing of xml files that are part of Dorico itself is not recommended, not documented, and not supported. Always make backups.