monk as a scout class? there are some problems with that
lack of decent class skills, they have half a list, but tis not sufficient for a proper skill monkey. not that they have enough skill points to use them all.
Does a scouting role require more than Acrobatics, Perception, and Stealth?  It seems that the Monk can specialize in a stealth role.
lack of proper skill augmenting powers beyond extreme jumping distance. most of thier abilities are all defensive and combat oriented
lack of proper spellcasting, like the rogue, they are a 3/4 bab noncasting class, but like the rogue, they get a form of compensation called flurry. much like a rogue gets sneak attack.
That argues for using monks against soft targets like enemy rogues or spellcasters.  Most of their class feature seem tailor made for mage killing.  Stunning fist also would seem to work well against annoying rogues and ninjas.  Flurry of blows is likely to annihilate most other support characters and casters very quickly.  Also, while there are several magic items that can nullify a sneak attack, there are very few that can negate the stunning fist.  
If all else fails, monks are quite good at grappling foes so that other party member can finish the job.
since the monk clearly doesn't have the skill points to be a proper scout or skill monkey, doesn't have the spells to be a caster, there is one last role. martial combatant, but they suck at that too. 
I disagree.