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Seperate selectors is one way to do it yes.. but the whole reason i ever made an expression is because i thought i could link the 'amount' of a new expression selector with say, position and color changes, to the amount of the expression selector that had that script generated expression.
I never had problems with linking expressions to properties that already have expression applied to them, so i wasnt that wrong in thinking that'd be possible.. I just guess the amount property is special~ (/me looks angry at people at Adobe)
I guess it should be somehow possible to make an expression that links to a variable amount of script generated range selectors, however, i don't think that's one's idea of 'simple and easy'.
Also, for za noobs in here (that want to use keylight of course), it's included in After Effects CS3, and the bugfix patch is freely available at The Foundry's site. The amount of changeable settings in keylight scared me off though, guess i should read into it >_>
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