[NTG-context] Suggestion for bibtex: command to switch between upper and lower case for title

Dear context folks, I would like to have the possibility to change between upper and lower case in titles for bibliography items, e.g. for English and German items. This is controlled by the bst-files as described in [1]. But changing these files after an update is rather annoying. Is there maybe even such a function that I do not know? Thanks, Xenia [1] http://www.ntg.nl/pipermail/ntg-context/2011/059359.html