What version of BSplayer are you using?
I'm using latest one (v2.29.965 beta, but also tried with v2.28.964) and AOT works perfectly.
The only time AOT doesn't work is if you have another window wit AOT property, in this case, the only way you have to make it AOT even on that window is to use overlay mode, and with this mode it's normal to not be able to click on the video window, since it's not really there, it's drawn directly to monitor (indirectly through video card drivers), but you can't interact with it.
Anyway the option for AOT enabled in the XML preferences file is
Code:
<AOnTop type="int">1</AOnTop>
For the other 2 methods (AOT overlay mode, AOT control window) I don't know, maybe BMOptions have something to do with them, but I don't know..