AdiIRC

Swap CTRL + TAB/CTRL + SHIFT + TAB keybinds with ALT + LEFT/RIGHT

Requires AdiIRC 2.3 or higher

See also /tab.

; use tab -m to include minimized windows.
on *:KEYDOWN:*:*: {
  ; alt+left to ctrl+shift+tab
  if ($mouse.key & 8 && $keyval == 37) {
    tab -p
    halt
  }

  ; alt+right to ctrl+tab
  if ($mouse.key & 8 && $keyval == 39) {
    tab -n
    halt
  }

  ; ctrl+shift+tab to alt+left
  if ($mouse.key & 2 && $mouse.key & 4 && $keyval == 9) { 
    tab -b
    halt
  }

  ; ctrl+tab to alt+right
  if ($mouse.key & 2 && $keyval == 9) { 
    tab -f
    halt 
  }  
}