In ArcMap 10, two point lines are created when you sketch into a layer that has COGO fields. You cant toggle this behavior but you can remove the cogo fields if you're not planning on doing any cogo work on this layer. This explains it. Following your post I've just tested in another line layer and you're right, it's only happening in layers with COGO fields. Unfortunately removing the cogo fields isn't an option, I'll just incorporate a merge hotkey for any situations where segmentation would be inconvenient. Thanks for the replies, all.
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