ggmm believe the fenkifad started with the devs 
They shortened it to that with the models. Stil it is very PS even if it that start as OOC slang first 
I hate it, actually. It's an obvious tech-style abbreviation for one thing, and it IMO is lacking respect. I'll
never call anyone M/F-enki IC-ly. Not even "Enki". It's Enkidukai.
Regarding the gender specifics, I think one should simply use "woman" and "man", since it can, as has been said, be assumed that the terms have gotten to refer to members of all races. I think that those who are offended by being called "man" are simply looking for something to complain about, or they haven't realised that "man" can mean either "guy" or "human", and that the context usually makes things pretty clear. Furthermore, I consider it rude to call someone by their race ("Hey, dwarf!"). If an additional qualifier is used ("good dwarf") it can be OK, but might easily sound condescending.
For Kran I haven't found a suitable word, though, since "thing" sounds stupid, even though technically correct. Possibly in this particular case the term of the species may have become term for the individuals as well (similar to "man" and "human" in RL english).
If talking in third person, and the race matters, then I think using "(fe)male <race>" or "<race[suffix]> (wo)man" is most suitable.
Also, I consider "sir" and "lady" as something you'd call those who you respect or who you have to pretend to respect (like superiors). It's IMO not necessarily related to nobility (or rather, officials, as nobles don't seem to actually exist, given the settings' take on government), and more or less something that one with decent manners would call most people.