Blend AppSrcAdd AppDstAdd has been deprecated for Unity 3.0, but it's useless in your shader anyway. That blend mode was only used with multiple passes, so if it ever did anything, then that was a bug. All your shader does is multiply the spheremap by light, as you describe. Also, SeparateSpecular is useless on iOS. I'm making you an updated shader presently.

Edit: Here's a shader. It's kind of a rough draft, in that I didn't really know where you wanted Double, Quad, etc., or how you wanted to influence the reflections with texture alpha. You should be able to modify it with your own multipliers as you like.

Shader "iPhone/Reflection/SphereMapped" {

Properties {
    _Color ("Main Color", Color) = (1,1,1)
    _SpecColor ("Spec Color", Color) = (1,1,1)
    _Shininess ("Shininess", Range (0.03, 1)) = 0.7
    _MainTex ("Base (RGB) RefStrength (A)", 2D) = "white" {}
    _Sphere ("Reflection SphereMap", 2D) = "white" {TexGen SphereMap}
}

Category {
    Lighting On
    Material {
        Diffuse[_Color]
        Ambient(1,1,1)
        Shininess[_Shininess]
        Specular[_SpecColor]
    }

    // iPhone 3GS and later
    SubShader {Pass {
        SetTexture[_Sphere]
        SetTexture[_MainTex] {Combine previous * texture alpha}
        SetTexture[_MainTex] {Combine previous + texture}
        SetTexture[_] {Combine previous * primary Double}
    } }

    // pre-3GS devices, including the September 2009 8GB iPod touch
    SubShader { 
        Pass {
            SetTexture[_Sphere] {Combine texture * primary Double}
        }
        Pass {
            Blend One SrcAlpha
            SetTexture[_MainTex] {Combine texture * primary Double, texture}
        } 
    }
}

}