Here is one. It only lets the character follow the waypoints like you said. If you want him the shoot at you too, you'll have to ask someone else.
;Artificial Intelligence Script
;Header
desc = follow waypoints, stop, then continue
;Triggers
:waypointstate=0:animate=2,waypointstart
:waypointstate=3:state=1
:waypointstate=4:animate=2,waypointrandom
:waypointstate=5:animate=2,waypointreverse
:state=1:waypointstop,timerstart,state=2
:state=2,timergreater=3000:state=3
:state=3:animate=2,waypointnext
;End of Script
BTW: I haven't tested it yet, but your character will stop for 3 seconds on each new waypoint, so I would set a long range between each waypoint.
Hope that helped
PCF Killer&Slaughter Machines Pack in progress
AMD Sempron 2,0Ghz - Windows XP Home - ATI All-in-Wonder X800XT 256mb - 1024mb RAM - using Photoshop and Milkshape
pigs_can_fly.hot.lu/pcf