Some questions about Playback feature

#1
how can i specify filters with playback feature , like specify Xvid MPEG-4 video decoder instead of Divx decoder filter that ProgDVB used as default to run AVI files ! and the same issue for video render .

another issue i think it's impossible :D , can i modify number of seconds shifted when use Next , Last over playback mode ?! it's 60 seconds by default and i thinks that's too much

Using 5.13.4 ver.

thanx
OS : Win XP SP2
CPU : P4 Intel 3.00 GHz "HT"
Memory : 2 GB
DVB-S : Sky Star 2 (2.6D) ( 4.4.0 )
Hotbird 13.0°E | Badr-3/4 26.0°E | Nilesat 101/102 7.0°W