Question Tiling Shaderlab shader

Would the following be correct in changing the UV tiling for a Shaderlab shader? ie Here simply doubling the tiling amount. For an iOS app so extremely time consuming proceeding by trial and error, publishing, compiling and deploying to a test device

Code (CSharp):

1. v2f vert (appdata v)
2.             {
3.                 v2f o;
4.                 _MainTex_ST.x=2;
5.                 _MainTex_ST.y=2;
6.                 o.vertex = UnityObjectToClipPos(v.vertex);
7.                 o.uv = TRANSFORM_TEX(v.uv, _MainTex);
8.                 UNITY_TRANSFER_FOG(o,o.vertex);
9.                 return o;
10.             }

 

I mean the "correct" way is to change the tiling amount on the material. But that works fine too.

 

Thanks. Having better luck doing it this way. Just need a way to dynamically change at runtime so its not a trial and error process.