I uploaded the new version of the resolution patch. I fixed an issue in Half-Life v220.127.116.11 that caused FOV to be increased dramatically on the load screens, I was intercepting it at the wrong place. Also added the patch for standalone version of Blue-Shift expansion pack and for Half-Life version 18.104.22.168.
The engine from version 22.214.171.124 has an odd quirk; when the FOV is increased, the left and right sides of the screen aren't blacked out when the game triggers that effect, so it looks weird in such cases. I haven't figured out how to fix that.
Do you happen to know what the MP3 filenames should be for both Opposing Force and Blue Shift?
The list is the same as for Half-Life. There's just less tracks for expansions. For Blue-Shift, you need Blue-Shift: Unlocked if you want to play it with v126.96.36.199 version of the engine, which does have MP3 support.
By default, Blue-Shift comes as a standalone game using an older version of the engine that doesn't have MP3 support, but also doesn't have that stupid elevator glitch I mentioned earlier.
Whether that glitch will start to hurt your character or even kill those scientists, preventing progression, may even be system-dependent. If I play on my Windows XP installation, elevator almost always starts to take my armor points away and sometimes the scientists die shortly after alarms goes off, but doesn't happen when I play on Windows 10. This is with the same settings on both installs, just different OS and drivers.
Supposedly lowering the frame-rate helps, if you don't have console enabled and don't know how to change frame-rate using it, the easiest way is temporarily switching from OpenGL/Direct3D to Software mode (and picking the highest available resolution).
There are some other differences between Blue-Shift and Blue-Shift: Unlocked, eg. in the former, loading text on level transistions and crosshair are yellow while in the latter, they're blue (like they're supposed to be). The former displays proper chapter titles in the load game menu, while the latter doesn't (you see the same map names that can be used in the console to launch them). In the former, some scientists' dialog at the Hazard Course and those texts telling what to press are missing, in the latter, these things work. In the former there's weapon bobbing and screen tilting when you move, in the latter there isn't.
Also the latter doesn't pack compatible so called graph files for game's AI, so when each map is loaded for the first time, game rebuilds them. It's a problem if you're starting from the old saves because loading saved games doesn't trigger rebuilding process of those files, so if they're not in order by then, NPCs (scientists, aliens, ...) will just stand still.