Here's a cool mod that keeps arrows from disappearing. Looks really neat. But, there isn't version that is MTW2 1.2 compatible yet. This version is for 1.1:
http://www.twcenter.net/forums/downl...o=file&id=1066
I looked on another site and someone recommended:
"Open descr_effect_impacts.txt , find the "effect_set arrow_impact_ground_set" section, and increase the "play_time" variable."
Here is original post explains how to manually change it:
http://www.twcenter.net/forums/showthread.php?t=78337