The latest version was released with plans for further updates and an improved UI (ED's hinted at a new Psx EMU turned out as Notaz work, whilst Zodttd maybe still working on this), but as it stands beta 5 offers the following:
GFX : Frame Skip settings, Frame Limit on/off, Show FPS on/off, Scale : Fullscreen or not.
Audio : On/off
Game Fixes : Root Counter Fix on/off, SPU IRQ fix on/off, Abe's Oddyseefix on/off
File Options: Save state, Load State, Load Game
Thats the lot so there arent any filter options or different scaling choices. OC must be done first in the OS aswell.
Hope that helps