Bioshock 2 Multiplayer side mouse keys

General Feedback & Requests
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1

Hi

According to BioShock 2 - Wikipedia this game uses Unreal_Engine_2.5.

There’s https://www.pcgamingwiki.com/wiki/BioShock_2#Input about the side mouse keys.

In C:\Users\username\AppData\Roaming\Bioshock2Steam\User.ini, [Default], there’re from Mouse4 to Mouse8, so in UserMP.ini, [Default], I wrote:
Mouse4=ToggleZoom
Mouse5=Melee
but it not works, both Windows 11 & Arch Linux KDE via Proton Hotfix.

I asked https://www.pcgamingwiki.com/wiki/User_talk:Nimbulan but still no reply.
Also on Steam Bioshock 2 Multiplayer side mouse keys :: BioShock 2 General Discussions still no reply.
Also https://support.2k.com/hc/en-us/requests/new but these are low IQ zendesk people, a dialogue of deafs.

Thanks.