If I imagine correctly what you are trying to do, yes there is (sort of)... at least one way comes to mind. As you say, if you adjust white balance on a digital camera the effect is reduced or removed, and with 'wet process' film it's a result of scatter on the film through the lens (no white balance on wet film). Poser does not pick that up. Atmospherics will give the light beam effect, high light settings will give the washed out light in the window, but no scatter around the inside of the window. What I'd suggest is trying a shape inside the window that is invisible to camera but has an ambient value of its own. A one sided square facing the window might(?) only cast light at the inside of the window and won't impact the other lighting. If you have an actual mesh light, it should do the same. You'll need to fiddle with placement, intensity and scale to limit the spread of the inner glare, but it'll give a reasonable approximation.

BTW, I'm sure there are other ways to do it.