Playing with "cg_shadows", setting the value to "4" gave me the the dynamic shadows on nearly every light source, including drawing shadow blob for your player model (note that its just a blob). However cg_shadows 4 is crazy harmful to your FPS. (per the ioquake3 documentation, it is long since deprecated anyhow. Though I do not see any alternatives available, doc linked below).
The pictured sunrays in ATCS are crap because I was fiddling with my vars too hard. they look way better when you fiddle less (PRO TIP).
Do not set "r_stencilBits" beyond 8, this causes crashes.
While writing the above post, I did finally see the file linked below. It outlines new cvars/related cvars to gl2 render capabilites + some old stuff that needed documentation in the first place).