No. External mods (Especially those not compatible with Tekkit and Forge) are not being supported on the server.

I find it quite strange how I have to repeat myself over and over again when it comes to clientside and serverside mods. You're free to do with your client as you see fit, but we won't support it. If the mods breach our Terms or Rules, we'll ban the effected users from joining the service.

shadow.... a shader mod is a clientside enhancement, not only that but shaders are clientside only.
a better place for this thread would be in the general discussion.

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