I agree topbunk. And I would suggest the individual concerned may be in deep **** when his logbook was analysed after a serious incident or accident. An insurance company could refuse paying on the strength of that alone IMHO.
Craggenmore I agree. But many individuals choose to add this figure into Command totals. And I know many non-UK airlines wont consider this as any more than FO time, because of the dubious rule interpretation by various airlines / authorities.
The ICUS label is daft anyway, because you are no more 'in command' than the pax in 26D, the way the law sees it.