caret.train.model.list.formula: Can take x and y values as the defaults.
In bjsmith/r-mvpa: What the package does (short line)

Can take x and y values as the defaults.

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## S3 method for class 'formula'
caret.train.model.list(formula, data, trControl,
  training.list, ...)

`formula`
`data`
`trControl`	passed directly to train caret; a list of values that define how this function acts. Default value if each item doesn't have its own trControl. See trainControl and http://topepo.github.io/caret/training.html#custom. (NOTE: If given, this argument must be named.)
`training.list;`	a list describing a list of train caret values to run. Should be a list of objects generated by get.caret.model.spec. Each should contain exactly two values, to be passed to train caret: method and tuning. If tuning is an integer, it will be passed to tuneLength. If tuning is a data frame, it will be passed to tuneGrid. If it is null, train's default values for tuneLength will apply. Otherwise an error is generated.