Arrows and Attack Bonus

Since combat is a 1 minute round, I'm seriously thinking of giving the Hunter class an extra arrow per round every three levels.  I'm still not sure what I think of the Attack Bonus rule in Microlite or if I want to use it but I suppose it could be used for the same effect (also used for throwing knives say...).

Attack Bonus

If the characters total attack bonus is +6 or more a second attack can be made with a -5 penalty. If the total bonus is +11 or more a third attack can be made at -10. For example, if the total bonus is +12, three attacks can be made at +12/+7/+2.

Following this a Hunter at level 4 would get +6 bonus to ranged weapons (+4 for being level 4 and +2 for class bonus) so would get the extra attack then but at a -5 penalty.  That works out however I wonder if it would be better to just hand out extra attacks as a class ability and forgo the penalties?

Hmmm an update:  Mulling it over more, I thought about a good compromise that lets me keep the fun of the Attack Bonus but gives Hunters a little bump to make them an attractive an option as the Fighter (who get the combat bonus with all types of weapons and a HP bump to boot):  Give Hunters one additional ranged attack from the get-go.  This way a level 1 Hunter would get to whip off two arrows or toss two throwing axes in a round and then at level 4 they could get off a third one at a -5 penalty.