Have another question. On return, I am actually thinking of just flying the PHL-DOH leg and combine it with a one way award ticket from DOH-SIN. Transit time is just much better this way as timings from CMB to SIN are very limited.

If I book a 1 week "stopover" in DOH with the QR revenue ticket, will I raise any red flag at PHL if I request to through check my baggage to SIN on 2 separate tickets (using PHL-DOH segment on revenue ticket + separate DOH-SIN award)?