Hello,
I got 2 phone SQ agents recently tell me that you can not have a stopover even for $100 on a star alliance one-way award booking. That stopover option is only available when flying entire itinerary on SQ flights. So, I can not fly GIG-FRA on LH F, have a stopover and continue on FRA-SIN on SQ F (wanted to avoid YQ this way ex-Brazil). No go. Is it in accordance with the rule or I may have luck calling again?