The shader collection is really too good now..with the only thing missing according to me is a 'heat distortion' of the things behind a fire/flame.I think it would be great to have this in the collection.Thanks.

refraction shader

Here's a link to The Game Creators site, where they make Dark Basic Pro, and bunch of other tools. That includes something I have had for a while, but haven't used in a long time: DarkShader.
http://darkbasicpro.thegamecreators.com/?f=darkshader

It's about $40, and you make shaders that you can (I think) export as .FX files. You make them all interactively and visually, and you can even edit the generated code.

I did see this on their list of pre-made shaders:
Heat Haze - Great for simulating refracted air near a fire
And this: Reflection Mapping - Reflects the environment onto the model

Sorry, but I didn't see this: Refraction Mapping

I'm sure if you know how to program really well, you could probably figure out how to make a refraction shader in DarkShader.

many things...

1) As stated above, this "heat haze" affect is simply a refraction shader. They are very easy to write, and already exist for GS. Zazang simply wants one added to the included collection.

2) There are many programs like Darkshader, that are better and cheaper (free). Such as NVidia's "FX Composer" & ATI's "RenderMonkey".

Exactly as xXxDisciple says

Unfortunately I have very limited experience coding my own shaders..all I'm capable of is to just edit some values here n there..thats why an official version of refraction shader will be great in the collection for people like me.