The commands will go to queue, but if you spam wheel kick ten times in the beginning of combat, don't expect to see your character doing anything else in the next twenty rounds. Meanwhile, if you see that you need to flee during this time to survive, the flee will go through after the wheel kicks are completed. This isn't doesn't help you much if you die before the flee goes through, which is why exsessive spamming during fights isn't generally a good idea. Of course wheel kick out of combat lags you for one pulse only(with the 'you're not fighting anyone' echo, in similar fashion commands like say, inventory and mistyped commands lag you one pulse(Kastellyn uses word segment in his post. AFAIK, one combat round is 12 pulses)).

Server lag will be easy to recognise, since it when it occurs, it totally jams things up, whether or not you are in combat. It will more resemble losing link than combat lag. Bad server lag also doesn't occur often(I remember two days during which it occurred this year). The only reason I mentioned it was that one of these server lag days was not too long ago(This week or was it last sunday evening?).