RE: 1000mah NiMH 2.2 oz OK For Pattern ?
I would say no problems.
There are many peole that use small packs and feild charge between flights.
Back in my fun fly days I used a tiny 280 mah NICAD pack and the was running 5 high power normal sized servos and the working far more than those on a pattern plane.
5 min non stop extreme flying could be had easliy. The control (servo response) would dramatically slow down as the pack neared emtpt after that... but you still had 45sec of gently flying to land before cut out.[X(]
Only in a fun fly eh?