I think what you have is pretty neat, and is probably the best way to do it! If you WANT a suggestion, maybe something like...
xp/spend Prime=4, 8/8
Where the first 8 is for Normal, and the second is for Flavor XP?
Best posts made by SunnyJ
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RE: Straw Poll: XP Spending in nWoD/CoDposted in Mildly Constructive