var hWndEdit = AkelPad.GetEditWnd();
var pasteMode = AkelPad.SendMessage(hWndEdit, 3127 /*AEM_GETCOLUMNSEL*/, 0, 0)
   ? 2 /*PASTE_COLUMN*/
   : 0;
AkelPad.SendMessage(AkelPad.GetMainWnd(), 1194 /*AKD_PASTE*/, hWndEdit, pasteMode);