[NTG-context] nesting \startitemize

hi there, context, just as latex can nest \startitemize, the context manual says max level 4. by default context uses the symbols for these 4 levels o level 1: bullet -- level 2: dash * level 3: asterisk > level 4: triangle it is very easy to change these per the manual. but how can i make \startitemize use ordered lists by default? this is sometimes more useful for scientific works... e.g. latex by default does: 1. arabic numerals (a) letters i. roman numerals o bullet (ok, the 4th one isn't very logical in latex either...) and another question, how can make \startitemize[a] do "(a)" instead of "a." ? -f -- first came reality. then there was wolfenstein 3d...