can non donators request for private warps to places they build in the "wilderness"?

Sadly not

Only ways of keeping it private is having a cprivated door or not saying the warp name in global chat

wait, but can non donators still request for warps? Im building a new place , and I would like to make a warp for it. is it possible without making it my home(/sethome)

Antonyoo, yes, just make sure something is built/being built as it is.

should I ask it in a pe?

Yes, you should almost always use a PE to contact mods when you need to request that they do something. Exceptions would be if you're sitting there *watching* someone grief your structures in the overworld.

Sadly, if you are a non-donor, you are limited to warps for your spawn market plot, spawn resident plot, or for your town. For more info on requesting warps, check out this post by MastaC

http://minetown.net/forum/m/672632/viewthread/1926653-read-first-guidelines-on-requesting-warps

as stated by yield...

Non-donors and any donors under $20 may only have warps for a shop, or a town center AT the main warp for their town. No private warps allowed. We do check ranks on players as we do petitions for this kind of thing and occationally go thru the 600-sum-odd pages of warps and check to see if they are or are not in the guidelines.

Luckily! you still have /home set