Here's an idea that might pacify the "no spoiler" camp.
Why not allow the pilot to put in the required aileron to keep the wings level, (basically in proportion to the rudder inputs) as a number of us have argued so far.
If we should suffer an engine failure approaching V1 and decide to continue, we can simply reduce the contol wheel input back to a couple of units while putting in the required rudder. Assess how the centreline tracking is going and if all is good and you feel there is excess rudder authority, start feeding in the aileron (and spoilers) back to where you want them. By that time you should be somewhere near Vr and all will be fine and dandy.
Even then this is only required if you estimate the REAL Vmcg (due to the existance of the crosswind in the first place) is between V1 and Vr.
For example the B737-800 with 26k engines. The highest Vmcg quoted is 105 kt at Max Thrust, 0 ft pressure altitude, and -60C. (At 20C it is 104 kt)
If I assume the ratio of crosswind to increase Vmcg is 1:1 then:
10 kt crosswind. Vmcg = 115 kt
20 kt crosswind. Vmcg = 125 kt
30 kt crosswind. Vmcg = 135 kt
35 kt crosswind. Vmcg = 140 kt
If V1 is less than this REAL Vmcg value, there is no issue, as an engine failure will result in an aborted take-off and the asymmetry disappears. Once you reach Vr well then again it doesn't really matter any more as you are now becoming airbourne and you are now concerning yourself with Vmca which is even lower than Vmcg (oh no is this another can of worms I see?)
It is only a concern if the REAL Vmcg fits in between V1 and Vr.
Often the difference between V1 and Vr is very small, just 5 kts or so. In many instances if your company utilises an unbalanced V1, it can be equal to Vr. In this last case have I just successfully argued that Vmcg is not a concern as there is no space between V1 and Vr for Vmcg to fit??
In the vast majority of take-offs, what is the difference between V1 and Vr? How long would it take to accelerate from V1 to Vr on one engine? Is this period long enough and is the shortfall in rudder authority great enough to really cause the whole event to end in tears on the side of the runway?
I don't know, I'm just thinking aloud.