That's all I do with my Ti600. Put a foil lid on it (us a small stone/stick to hold it in place) and boil 8-16oz of water with my Ion (1st generation) stove. Then, pour it into my meal pouch (re-packaged noodles, Liptons, or Enertia meals [www.trailfoods.com]). Put the filled pouch back into the cup and cover with my bandanna. Wait 10 minutes, and then eat. Though often after 10 minutes the food is still too hot. YMMV.
I think their is a picture of Ryan eating noodles out of his cup. So, you might be able to make a small hot meal in the cup and suplement with other dry foods.
The real problem with using a small cup is finding a stove whose flame pattern is such that they actually come in contact with the bottom of the cup rather than up the sides. A top ported V8 juice can sized (side ported stoves' flame pattern is still too wide) stove is probably your only option other than Esbit.
BTW, I removed the handles, as the cup is small enough you can easily grab it with you gloved (Possum Down) hand or bandanna. I also found that the welding "dots" on the inside of the cup are at 8oz, 12oz and 16oz respectively which makes in-field measuring quite easy.
My "other" pot is the MSR Ti Kettle, but I had a 20% off coupon burning a hole in my pocket, so I bought the Snow Peak. No regrets yet.