^^^ not sure if applicable. but my HTPC has different settings for 'desktop' and 'video player'. I've been able to get what I consider good results for web browsing, while still maintaining great results for media playback.
as far as abl behaviour(I'm still not sure I even see this?), I have my f8500 set with the eco mode to low because it's too bright on the normal settings. I had the cell light turned down to 10, but read that was not a good method of dimming the screen. apparently I'm supposed to use contrast, but in order to get the image comfortably bright I have to turn it down well below 60, at which point it really ruins the image. anyway, the eco setting seems to do the trick for me. but what I've noticed is that there is NO dimming between eco off and the low setting, with a full white image. there is noticeable dimming with darker content however. I'm wondering if the eco setting of low actually reduces the amount of abl. it's like it permanently puts the tv into the 'abl mode'(I don't know how to describe it) and instead of getting brighter when the scenes get dark, it just maintains that dimmer white level the whole time.
again though, I've never really seen abl 'kick in' in my life. and only noticed this because one time I was trying to determine whether I wanted eco on or off, and had a webpage displayed and it made no difference. I thought there was an issue, but when I checked again(and had a darker image on screen) it worked like normal again. I think it would be interesting to see what somebody who is sensitive to ABL behaviour thinks about using the eco mode(low setting only though) and if it actually reduces the affect of abl, or just dims the screen differently