Finally I found out, how to rebind reverse-history-search from Esc + / to Ctrl + R in ksh.

If you like that feature from bash, include this in your ~/.kshrc file:

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# bind reverse-history-search to Ctrl+r
#          search: Ctrl+r > search-word > Enter
#     next result: n
# previous result: Shift+n
#
# be carefull while copying escape characters
# original command: trap '[[ ${.sh.edchar} == "^R" ]] && printf "^[[2K\r%s " "(reverse-history-search):" && .sh.edchar="^[/"' KEYBD
# ^R and ^[ are control characters
# insert them with Ctrl+V -> Ctrl+R and Ctrl+V -> Esc in vi edit mode
trap '[[ ${.sh.edchar} == "^R" ]] && printf "^[[2K\r%s " "(reverse-history-search):" && .sh.edchar="^[/"' KEYBD

Hope it helps,
visit