Mods - Not sure if this is the right place for Rocketmiles so please move it to the appropriate place.

I havent used rocketmiles yet since I never found any hotel rates I could work with. However, for next week I see a real sweet rate at a nearby Hilton (where I have no status) lower than my regular hotel corporate rate and which gives 1000 miles for the night. That combined with the ongoing conga, would effectively net me a total of 3000 miles (1000 for the stay + 1000 for being referred + 1000 for eventually referring someone)

My questions:
1. The rate quoted is the lowest rate available on the hotel website for a basic room with 2 doubles. I'd like to pay an extra $10 for a king on the Exec Floor. How is that possible with rocketmiles since they dont offer that option? If I call the hotel directly will that invalidate my rocketmiles booking?

2. Who actually charges me for the booking? Do I get the receipt from the hotel or from rocketmiles? I'd rather not have to submit a receipt from rocketmiles for reimbursement and raise unnecessary questions.

Any insight appreciated.