[NTG-context] font switches: bold, slanted, etc.

Hi, Basic font switches are bold (\bf), italic (\it), slanted (\sl), ... and one can have bolditalic (\bi), boldslated (\bs), etc. We also have style=bold, style=slanted, etc. Is there some way to manipulate font switches so that \bold{This text is \slated{bold}} for example, would put the word "bold" into boldslanted? A natural use of this is, e.g. headers that get typeset in bold. What if the title contains a word, say, in slanted (or, worse, some mathematics)? Alan