[rules-users] decision table - access to params $1, $2, ... as an 'array' + esc aping ',' in field values?

Hi, I wonder if it's possible to access parameters in the decision table template as an array? In other words, instead of addressing individual parameters through numbered notation (field1 > $1, field2 > $2) is it possible to do something like this ( HelperClass.checkAllMyFields($parameters) ), where 'checkAllMyFields' method accepts an array of objects/strings? Another slightly related question is whether it is possible to use 'comma' as a character in the field value? In other words, if I have a string "abcd,efg" and I want it to be interpreted as a single parameter, how do I escape ',' character? Thanks. Vlad