well, yes and no.
No: you did it already 
yes: it is not too ‘obvious’
When I started this thread I was not aware about thepowerofmediocreties thread and only partly of gnomishs.
Both are near to what I wanted, from different sides.
tqfan had a list of doombolt-builds, where he stated, that some where ‘missing’ (see quote in first post).
In mediocres thread then I saw that all options where tested already (except cold, that is).
Gnomish then posted his ‘crazy’ idea of pierce aar, and I hoped that this example was enough for you.
Your Trozan example is btw not too far away from what I mean. But after tqfans info on conversion and its mech-issues the whole point of this thread became a little less interesting.
Btw, SR performance is irrelevant. In fact I also was looking for rough build ideas, where everyone would say from the beginning: “aaah unpossible” with the arenamodes in head. Because I dont care about those.
PS: the other 2 persons in this thread answering before you with irrelevant statements are on ignore since a long time. They share a certain psychology with a third ignored person, that I dont tolerate in my online life. Just so that they know.
To your questions:
Not different, but way off. Like gnomishs example of pierce aar.
I have stated that many times, I only care for main campaign. And you wouldnt even know its perfomance, cause it was dismissed before even tested.
skill yes, as it can be controlled, gear not really as it is dropping random. If gear comes into play than only as e. g. “well, you need some conversion, or DA or OA…” Nothing too narrowed down.
Rather skill AND damage type.
of course, but not necessarily
Depends
Final example: Cold doombolt. It’s the only one missing, because reasons. Now, what I expected, was someone telling me: well, cold doombolt is missing because reasons (which indirectly mediocrities thread shows, so HE got me right. And have you seen the incredible amount of NAGGING by certain people in his thread? So disgusting…).
I then would have checked, if there is even SOME way to get close to realizing it, e. g. converting its damage to the max the game allows (with gear in this example) if at all, and see what could be created around it. And Trozan could have been an idea in that regard, not because it helps with doom bolt but the skills periphery of e. g. a warlock. And while doing so totally ignore anyone whining about its performance.
This is an example, mind you.
Getting a feeling now?
but I guess we can think of such builds as missing too.
) are still untested? If any?