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How much of a weighted load balance are you working with? Reason I ask, if the actual links aren't that far from 50/50 (say up to 60/40), using 50/50 is often "good enough" because, except for something like PfR, most load balancing is "static', it won't react to actual link usage.
PfR, though, does support dynamic load balancing and although early versions only supported static routes and BGP, later versions support PIRO. (NB: if you use default routes to Internet, static PfR, should do the trick. BTW, PfR, I believe, requires more than the IPBase feature set.)
