While waiting for someone to reply, I did some research and found this temporary fix. If I make a prefab with the vegetation asset with its ‘Affect Distance Field lighting’ turned off, and add static geometry with visibility off in the prefab and keep its Affect Distance Field Lighting on, then i can control how much soft indirect shadows it will generate. Here is an example:
In this screenshot one close to camera is a prefab with 3 small spheres inside the prefab (I used a temporary sphere mesh, will be tweaking to something that will suit better), second one is just a static mesh, same from the one posted before.
Keep all of these off under Render settings:
Anyhow, this will work only on flat surfaces. I will still keep doing some research on this.
If someone could let me know of a proper solution, its much appreciated.
Thanks