relax I believe that this arrangement is just fine. As long as it sounds good, I wouldn't be concerned at all. The speaker switch just connects one or the other or both output connectors internally to the amp's output. If you want to prove this to yourself, set the speaker switch to "both" get a cheap ohmmeter from RatShack & ohm between the two [+] posts, also between the two [-] posts (AC power off & speakers disconnected). You should read very close to zero ohms. If you do then all is well. But I wouldn't even bother with that.
Bi-wiring using both speaker 1 and 2 outputs
I have a McIntosh MA6450 integrated amp. The amp supports two pairs of speakers and allows both pairs to be on at the same time. Currently, I am using this feature for bi-wiring purpose. That is, I connect one pair of cables from "speaker 1" to the low-frequency posts and another pair of cables from "speaker 2" to the hi-frequency posts. It works fine. Are there any protential problems with this kind of wiring?