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I came up with a diagram I like. Not tested yet, but running it through my mental guitar wiring diagram processing unit, I think it should do just what I want with no problems.

Here's the diagram:



3-way switch
Series/parallel switch
Stereo/mono switch
Two volume and tone circuits
Two Jacks

In Mono, only Jack A is connected and the series/parallel switch also redirects the pickups from one volume and tone circuit to the other.

In Stereo, parallel, the neck pickup will only go to Jack A and Vol and Tone 1, and bridge will only go to Jack B and Vol and Tone 2. When the 3-way is selected to only one pickup, the other pickup and corresponding output are not connected. When series mode is selected, both pickups go to both outputs through Vol/Tone 2.

In both Stereo and Mono, the 3-way switch is bypassed in series mode (both pickups are connected) and hot always goes to Vol/Tone 2

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http://www.tinyhouseandland.com

Man,
That's complicated!
It may be possible to use an output jack that has a built in switch contact and lug.
Seems like you could run the separate outputs to the two jacks, and then tie a jumper between the swtich contact and the hot contact of the other jack. When you plug in both jacks, the two outputs are separate, when you unplug the jack with the switch, both outputs are tied together at the mono jack.
You may be able to eliminate the mono/stero switch- unless you want that as a switch function.
I don't use tone pots: with my bad hearing, I need all the screeming treble I can get.
- just an idea.

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wah
Wah-wah-wah-wah
Wah

If you want it simple,
what I do with my acoustic guitar,
with a Baggs saddle pickup through one jack,
a mag soundhole pickup through the other,
and when I want mono,
I run them through an a/b box.