feature request: ecmp hash algorithm

Hi,list, I planed use bird box as a load balancer, but I did'nt know bird's ecmp implemention weather support per-connection or per-packet.(I used FREEBSD platform.) And now, bird cannot config ECMP hash algorithm FTOS 9.2(0.0)/9.2(0.2) Configuration Guide for the S4820T System , such as SIP, DIP ,SIP XOR DIP, port etc, base on tulple. Support it will be cool. thanks Simon