Hi, you can try “Quick Launch” tool for that:
“Tools > All Commands > Tools > Quick Launch”
Type in wanted shortcut, like “ctrl” plus “+”-sign    [plus wanted letter]

Something like ctrl+f4 or ctrl+L, or ctrl+shift+L … and wait an second, till the list is filtered.
What to type in, depend on your language.
For English you can type “ctrl”, “shift” and “alt”. Also “End”, “Home”, “Del”, “Back”, F1, F2…etc
For German that would be “strg”, “umschalt” and “alt”. Also “Ende”, “Pos1″, Entf”, “Rück”,…. etc