3ds Max :: Bypassing Maximum Value Cap?

I'm Rendering a hairy blob as my main character in an animation. I'm a big V-ray fanboy, so I'm using it to render this scene. To bypass having to buy other hair-rendering software I'm using the built in Hair and Fur plugin.

To get V-ray to render shadows, I'm using a Standart directional light with "V-ray shadow" (v-ray version of raytraced shadows) as shadow option.
Unfortunately this light only reads the light information through it's built in shadow map, so in the end it does not matter how much i increase the quality of V-ray shadow, the light ultimatly sets the bar for the quality.

Which is fine, just that the "Resolution" in "Hair Light atr." of the "Directional light" only goes up to a resolution of 8192.Is there a way to bypass this setting and set it to a higher value like 16384 or 32768?With a resolution of only 8192 I have to blur the result, as seen in the image. Suprisingly there is no flickering between the frames, yet I would like to get sharper shadows.Also the rendering time does not incrase, when changing the resolution of the light.

PS: No other way to get shadows to render, unless I render as geometry, which is due to compatibility and speed issues not an option.