finickity
Fastidious and fussy; difficult to please; exacting, especially about details; meticulous and particular.
It's great when you've taken the time to have persuade someone to explain to you the ludicrously finickity way it wants a particular command typing in. Very powerful, but not for end-users.
Where it comes from
Possibly a blend of finicky + pernickety
Adapted from the Wiktionary entry finickity (CC BY-SA 4.0).