For the Halfling Reaper - I don't see any problem with it, except that you need to state "You do not add the proficiency bonus to attack rolls when used as an implement."
I've just used these two houserules in conjunction;
[sblock]Being Small - PHB p. 44
Replace the text with the following;
Being small, you must use smaller weapons. Reduce the damage dice of all weapons you wield by one step. However, you may wield weapons with the small property without reducing their damage dice, and you may wield versatile weapons without reducing their damage dice size. If you do this, however, you must use them two-handed, and you do not benefit from the effects of the versatile keyword.
One Handed
1d10→1d8→1d6→1d4→1d3
Two Handed
1d12→1d10→2d4→1d8→1d6
Weapon Implement
Tier: Heroic
Prerequisites: Proficient with weapon, Implement class feature.
Benefit: Choose a weapon with which you are proficient. You may use that weapon as an implement. If it is magical, you add its enhancement bonus and critical effect to your power, as though it were an enchanted implement. When using a weapon as an implement, you do not add its proficiency bonus to attack rolls.
Wizards with this feat may replace their existing Implement Mastery with the following Implement Mastery.
Weapon of Power: Once per encounter, as a free action, you gain a bonus to a single damage roll equal to twice your Strength modifier. You can declare the bonus after the attack roll or after the damage roll. You must wield your weapon implement to benefit from this feature.
Special: You may take this feat multiple times. Its effects do not stack. Each time you take this feat, choose a new weapon with which you are proficient.[/sblock][/houserule pimpage]
Mage Rage should only be usable with At-Wills. Keep in mind that ranged and area attacks provoke OAs.
