Processing Rules (Product String)

Could ould you please give us a smart and elegant way to set the product string using processing rules.  We have some pretty robust / absurd product strings in our implementation - so I am happy to be part of a beta/pilot.

for example:

;afa7a60c3a34479cae357ec8efdd2170;;;event36=24|event131=669.98|event132=11|event133=658.98|event137=1|event153=1|event165=47|event212=0|event213=5.69|event214=5.31|event158=0|event163=0;evar53=33900103|evar62=24|evar68=47|evar72=101|evar77=false|evar90=deal|evar29=false|evar63=669.98~11.00~658.98