My understanding is the runearm melee weapon imbue does not scale with spellpower. However reading in the U29 release notes about the evocation DC changes to runearm can a dev comment on plans, if any, for melee imbue to be affected by the relevant spellpower. Kinda feels like runearms are missing out when T4 ES can add 3d6 light damage affected by spellpower or paladin on hit light damage improves by melee power. And then there is sneak attack improved by melee power.
It seems runearm melee imbue has been forgotten and that makes me sad.