In iTerm select Bookmarks -> Manage Profiles -> Keyboard Profiles -> xterm. Add key mappings:
| Key | Modifier | Action | High interception priority |
| Hex code 71 | Command | send escape sequence: q | [x] |
| Hex code 77 | Command | send escape sequence: w | [x] |
| Hex code 30 | Command | send escape sequence: 0 | [x] |
| Hex code 31 | Command | send escape sequence: 1 | [x] |
| Hex code 32 | Command | send escape sequence: 2 | [x] |
| Hex code 33 | Command | send escape sequence: 3 | [x] |
| Hex code 34 | Command | send escape sequence: 4 | [x] |
| Hex code 35 | Command | send escape sequence: 5 | [x] |
| Hex code 36 | Command | send escape sequence: 6 | [x] |
| Hex code 37 | Command | send escape sequence: 7 | [x] |
| Hex code 38 | Command | send escape sequence: 8 | [x] |
| Hex code 39 | Command | send escape sequence: 9 | [x] |
After this Applekey+numbers, Applekey+q and Applekey+w change the window in Irssi.