Videotraf: BMOUSE makes it possible to use both axes in freelook.

Videotraf: Save changes. Now open SW.CFG and look for line MouseInvert = 0. Change zero to 1. Save changes.

Videotraf: As most of us already knows, SW's mouse implementation sucks, the same way as it sucks in Redneck Rampage and Blood. There are ports, but both of them crash on my machine (XP SP3, Jonof's right at start and SWP at random).

Thankfully, one crafty Duke fan made a patch which resolves the problem for DOSBox.

BMOUSE makes it possible to use both axes in freelook.

Download the patch from author's website (it's a piece of art): http://swisscm.duke4.net/ download section

Unpack the archive. As we're going to use this patch with GOG's Shadow Warrior release, copy the BMOUSE.EXE to game's folder.
Now the tricky part. I'll try to be specific as much as I can, but I came to it after a lot of experimentation, so I may miss something.

Run the SW's Settings program, from the shortcut. Go to Controller Setup > Choose Controller Type and select Keyboard and External. Next, select Setup External > Change External Program Name, type BMOUSE.EXE and press enter, then esc three times. The settings program now will ask you if you want to save changes - select yes.

Open dosbox_swarrior_single.conf in notepad. Find section titled :swarrior and make it look like this:

:swarrior
cls
@echo off
@COPY sw.dat sw.exe
cls
bmouse.exe launch sw.exe
cls
exit

Save changes. Now open SW.CFG and look for line MouseInvert = 0. Change zero to 1. Save changes.

Now run Shadow Warrior via the GOG shortcut and select the main game. If everything was done correctly, in terminal window you'll see this message: External controller found on vector 60. Try to play with proper freelook now (mouse aiming should be ENABLED, press "U" to make sure of it)

In settings program, via Controller Setup > Setup Advanced Control Options > Advanced Mouse setup, you can configure X and Y axis. Rest of the setting will be ignored by BMOUSE. You probably should go there and experiment with settings to get as fluid as possible freelook. It won't be perfect, but still better than default settings.

If for some reason your Y axis is inverted, go back to SW.CFG and set MouseInvert to 0.

I hope this will help you enjoy Shadow Warrior :)

Please post here with any issues and questions.

F4LL0UT: I think you misunderstood the purpose of BMOUSE. All Build Engine games I've played (especially the ones BMOUSE is meant for) do support both axes in freelook by default, you just have to press "U" to activate vertical aiming. The issue BMOUSE addresses is that the Build Engine only processes one axis at a time but does switch between them per frame (or at some other frequency but frames seem to be the most logical). So in theory there's slight discrepancies but IMHO they are so tiny that they are not an issue. The real issue with Build Engine games is that by default the ratio between both axes is screwed up but you can tweak this through the advanced options of the games' setup programs.

SwissCM: Actually, the way it works is that whatever axis has the greatest velocity is the one that gets updated, so if you're moving the mouse to the left more than you're moving it up, only the horizontal movement will be updated. This does cause some rather bad control issues, I wouldn't call them tiny.

tinyE: What is a BMouse?
Given that I'm the one posting this, smartass replies are welcome but I would like a serious answer thrown in there somewhere. :D

korell: It is a DOS mouse driver that some guy built for the Build engine games, that doesn't use the axes velocity for filtering which axis to read at any one time. Taken from a read me:

bMouse - Fixed mouse driver for (some) Build Engine games v0.6
External driver code Written by Mark Dochtermann
Modified by SwissCM

tinyE: Thanks. I only ask because I recently started playing all the old FPS games with a mouse for the 1st time and I've been delighted with the game play.