I've just started using a rule in the old Arms Companion on the effects of attach - but not on the effects of removal which I think is a GREAT idea!
This is what I've done so far - http://craigjohn.co.uk/share/RMFRP-Rules-Charts.pdf
(I created the arrowhead images myself)
It's the start of our group's EXTRA rules. As you can see, it's the first entry. There's more going to be added like the Morale rules from the RM Companion 4.
I'll start to think of the removal penatlies!
This, along with the potential changes to the way I currently deal with missile parrying (thanks to the current missile parrying topic http://www.ironcrown.com/ICEforums/index.php?topic=8224.0), will make my archers a little better in the group and make the archers something to be feared (as well they should be)!