Just because Krell doesn't print the specs for 2 ohms in the manual, doesn't mean it won't be able to handle the load. I think specs for 2 and 4 ohms are more important to people now because brands like B&W and Martin Logan are more available due to them being sold in places like Best Buy. A typical receiver just won't cut it for those types of speakers, despite their power ratings. But you do have a point about what's printed in the manual. Personally, I would like to see more specs in the manual to avoid confusion. Having owned the amp, I think it will be fine used either bridged or 2 channel.
One thing you can do that should answer some questions, is to run the amp you have bridged into just 1 of your speakers as a test. If the amp has trouble driving the one speaker bridged, you can expect the same results if you get another amp. Also, many people report that bridging a stereo amp lowers the sound quality. Of course, results will vary depending on many factors, but I think its something to keep in mind.
If you do try the single amp bridged, make sure you compare it to just 1 speaker non bridged. It makes the comparison much easier.
One thing you can do that should answer some questions, is to run the amp you have bridged into just 1 of your speakers as a test. If the amp has trouble driving the one speaker bridged, you can expect the same results if you get another amp. Also, many people report that bridging a stereo amp lowers the sound quality. Of course, results will vary depending on many factors, but I think its something to keep in mind.
If you do try the single amp bridged, make sure you compare it to just 1 speaker non bridged. It makes the comparison much easier.