You can not add bumpmapping(or any other shader) with an entity. The shaders are defined in the material.
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i would stay away from bumpmapped textures because they cause fps drops on swap buffers
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Well performance wise the amount of detail a bump map adds is still better than actually modelling thoose details. The details you take away from your map when taking out bump mapping needs to be added elsewhere, which is likely to cause an even bigger fps drop.
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the env sun isnt as hard as you think"
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Yeah, I doubt the env_sun cause a drop of more than max 2-3 fps. It is just a simple sprite which is being scaled up and down.