I hadn't heard about a single lead 2-bulb electronic ballast yet. Interesting. Anyway, yep - I would definitely jumper the two pins together and connect them to the single lead. I'm not so sure you will be overdriving, though. With only one lead, the ballast will most likely sense the bulb length and power it as a single bulb.
Otherwise, when it would be wired for normal operation, every time a bulb blew, the other bulb would be overdriven. Try it, though.
- Sam P -
plantedtanker in limbo - all tanks currently in storage