As now, inside <EnhancementAbilities> there can be only one enhancement available. For instance,

<EnhancementAbilities>
<Enhance
enhancement= "+efficient:10"
enhancement= "+hpbonus:5"
/>

This does not work. Only the last enhancement is active, for this example, hpbonus.

Having multiple <EnhancementAbilities> on a single deviceslot does not work either, from same configuration above,

<DeviceSlot criteria="s" >
<EnhancementAbilities>
<Enhance
enhancement= "+efficient:10"
/>
<EnhancementAbilities>
<Enhance
enhancement= "+hpbonus:5"
/>
</DeviceSlot>

This does not work as well.

Right now the workaround is make separate devices (one virtual, one real) but that is rather messy and not really perfect solution.

megas 7 days ago:

This is already possible, but only for enhancers with defined types, which prevents stacking. For example, give your efficiency something like type="myBonus1" (or whatever name, see laser collimator as an example) and your hpbonus type="myBonus2", and it will apply both. The only problem with this method is multiple devices cannot stack with each other. If you want an enhancer that can stack with itself (no type given) and give more than one bonus, then your ticket stands.

kwm1800 6 days ago:

@megas : Yes, your solution is indeed having separated devices, and you just mentioned the problem of using such method.