Quick idea: improved magic weapons?

Alright, here's a random idea:

Instead of a +x enhancement bonus weapon giving you +x to attack and damage, it instead gives you +x to attack rolls, +x to opposed checks using that weapon, and a +xd6 to damage?

Then, we could have neat things like:

Flaming: You deal an additional +1d6 fire damage with your weapon. In addition, you may, as a free action, choose to deal all the dice of damage from your weapon's enhancement bonus as fire damage.

Fiery Burst: As Flaming, but on a critical hit, your weapon deals it's additional damage as +xd10s, instead of +xd6.

So, in other words, if you have a +1 Flaming weapon, it deals +2d6 damage, which can either be half fire damage or all fire damage.

If, instead, you had a +3 Fiery Burst weapon (a +5 equivalent), it deals +4d6 damage, which increases to +4d10 on a critical hit.

Actually, another idea (maybe for another time) is to have enchantments on weapons improve based on your BAB; in other words, Flaming automatically progresses to a better enchantment that let's you, I don't know, light folks on fire, or shoot fire blasts, or maybe even do zany stuff like burn the souls of the guy you just killed.

So if you find a Flaming weapon, your reaction is "Cool. This'll be useful", and not "Oh man, more of this crap?"

Hmm. This seems like something that should be fleshed out more. One thing to watch, though, is the problem that most of the time, +1-equivalent 1d6 special abilities are reduced in power by having a non-physical damage type, so there should be an offset for that, or else no one will ever use them. (Perhaps ensure that extra damage is affected by DR for a start, although that's not always much of a downside even when it's relevant.)

Tentative suggestions for specific powers: flaming could have a limited ability to set enemies on fire after hitting them (e.g. 5/day), frost could impose a dex penalty (?) with similar usage restrictions, shock could dazzle or even daze similarly, and so on.

Icy Blast: On command, an icy blast weapon is sheathed in icy cold (though this deals no damage to the wielder). On any hit, this cold washes over the creature struck, dealing +3d6 points of bonus cold damage. On a successful critical hit it instead deals +6d6 points of cold damage (or +9d6 if the critical multiplier is x3, or +12d6 if the critical multiplier is x4). Bows, crossbows, and slings with this special ability bestow the bonus cold damage upon their ammunition.

Strong evocation [cold]; Caster Level: 21st; Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, cone of cold; Market Price: +6 bonus.

Fiery Blast: On command, a fiery blast weapon is sheathed in fire (though this deals no damage to the wielder). On any hit, this fire engulfs the creature struck, dealing +3d6 points of bonus fire damage. On a successful critical hit it instead deals +6d6 points of fire damage (or +9d6 if the critical multiplier is x3, or +12d6 if the critical multiplier is x4). Bows, crossbows, and slings with this special ability bestow the bonus fire damage upon their ammunition.

Strong evocation [fire]; Caster Level: 21st; Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, fireball; Market Price: +6 bonus.

Lightning Blast: On command, a lightning blast weapon crackles with electrical energy (though this deals no damage to the wielder). On any hit, lightning coruscates around the creature struck, dealing +3d6 points of bonus electricity damage. On a successful critical hit it instead deals +6d6 points of electricity damage (or +9d6 if the critical multiplier is x3, or +12d6 if the critical multiplier is x4). Bows, crossbows, and slings with this special ability bestow the bonus electricity damage upon their ammunition.

Strong evocation; Caster Level: 21st; Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, lightning bolt; Market Price: +6 bonus.