DSE used with Keyboard only


i am wondering how i can use DSE only with the keyboard.
in a resultlist, how can i
a) reveal the document in DT?
b) open the document with something other than DT, if the result entry is from DT (e.g. preview or adobe reader)?

thank you,

Cmd-O and Cmd-R can be used to open results and to show them in the Finder, see contextual menu. But there are not shortcuts for the Open With submenu yet.