I'd be wary of "gear" enhances, it worked out really well for Berserk, Warcry, Defender and various other duration JA's out there. Just imagine a set of gloves that read,
DEX +5
INT +5
"Enhances Temper" +5

The effect would make Temper 10%, at the expense of losing 4% haste.

We don't want this.