The use of the term "non-standard" is simply a part of communication. If you would normally, for example, select flap 2 before the gear but you decide it's more appropriate to do it the other way around, then the phrase would indicate to the other pilot that you haven't forgotten the flap. It just helps the PM know what you're thinking, to avoid any "conflict that might ensue" and for him to do what he's asked rather than entering a debate about whether the SOP states you should put the flap out first.
Conversely, instead of "non-standard", you could say, "I think we're a bit fast and with this tailwind/weight combination and with the prospect of the wind changing abruptly here as it often does in TPE, I think I'll take the gear before the flap, what do you think?"
No, on balance, I think non-standard sums it up nicely.
STP