Try with 1176x664.

FIXT not upsacale the game, only show more content in the screen, so your need to set a resolution with that you are comfortable and left that the hardware upscale the game to fit the screen.

This resolution is not supported, its either 800x600 with bars or 1367x768 with tiny everyhing lol.. and the upscaling does not work.. how do people manage to make this work.. seems like a simple solution

This is because you have checked 2x scaling, uncheck it and you can select between all the supported resolutions.
For me, with a monitor with a native resolution of 1920x1080, the one that best works is 1280x720.

No, they shouldn't, since it's buggy.
In my experience using the TeamX patches is much safer. And then some...it adds too many things, some of which introduce too many bugs.
Fixt is still in Alpha.

Have you actually used FIXT or even read about it?

1) Bugs aren't really an issue. I've not encountered any and I've played every year for a several years through a couple of versions of FIXT (and I've lurked the creator's thread at No Mutant Allowed so I've seen people post some bugs, plus he has a link in the first page to the wikia where he lists bugs and if they aren't fixable - and why).
2) So then, don't install the extra stuff? Download the Fixes-only version or go ahead and download the full custom version because there is a purist (fixes-only) version for you, a Standard (half-purist, only some new stuff), and then full blown - everything version. In addition, the full custom version has a customize option so you can choose and change what you want/don't want.
3) Alpha, so? It's content complete as far as what he can do with it as far as Fallout 1 goes. It's considered Alpha because he's now working on getting it so it ports Fallout 1 into the superior Fallout 2 engine. But it can be considered complete because the creator has fixed all the bugs he can in Fallout 1 (iirc some of the bugs left are because of the engine Fallout 1 uses and the port to the Fallout 2 engine should help fix those).

So, Fallout FIXT is still the way to go to patch Fallout 1 because other than you, I've not head people complaining about it. First time players can (and imo should) just download the fixes only version and not have to worry about any possible bugs added by the new things as you suggest.

What's FIXT?

I was just replying in kind.

Fresh install of Fallout 1, fresh install of fixes-only Fixt, game fails to launch. 'Failure to initiaize input device.' The troubleshooting guide link Fixt installs goes to a 404 on Dropbox. Deleted Fixt, switched to individual patches, no problems.

Fixt works fine for me, though clicking on the location column on the map screen freezes the game, but I rarely used those labels before anyway, I always click directly on the map. Have done Sands and Vault 15, I'm now in Junktown with Dogmeat and I have successfully killed Gizmo without somehow becoming guilty of killing Killian (the bug I had with the Bethesda 1.2 release a few days ago) so all-in-all good stuff!

It should also be worth mentioning that way back when I previously inquired about this I never ran into any glitches or problems with FIXT, either. However, I'm on Windows 7 and I have no idea if Windows 8/10 has issues. On the other hand, I can also say that the version I was is the same version that's there right now.

On the third, mutated hand, the next version is supposedly coming sometime this year. I don't know if that's confirmation or just rumour, but the guy working on it resurfaced not too long ago and said they're still working on he next release but have been plagued with computer problems.

I've got the italian translation of Fallout NPC Mod v3.3 but I can't find it.

Can someone upload it?

You already have it.

The first post was last updated on 2011, is there any information or mod that have changed since than?

There's Fixt now (not quite stable yet, though)