I require the standard action, but I do have a few houserules regarding the energy and energy burst type weapons.
The first is that I allow the energy enhancements to stack... That is, you can have a flaming, flaming, flaming burst weapon, which deals 3d6 (or 2d6 & 1d0 on a crit) extra energy damage. This applies to the alignment enhancements, as well. So, you can have a holy holy weapon.
The second is that I allow different energy types on the same weapon. That is, you can have a flaming burst icy burst weapon. Which deals and extra 1d6 fire and 1d6 cold damage (or d10s on a crit). This applies to the alignments, as well. So you can have an unholy, axiomatic (or even a holy, unholy) weapon.
The third is that a single standard action is required to activate each distinct energy effect. So, if you had a fiery, fiery, flaming burst, icy, icy, icy burst weapon, you'd activate first the fire portion, then the ice portion, requiring two standard actions.
I also, sometimes, make other enhancements (such as holy, etc., and brilliant energy 'upon command' abilities).
Letting go of a wielded weapon deactivates any activated enhancements. So a flaming weapon goes out, for instance.
Later
silver