Does Cakewalk, or anyone, make an analog soft synth that has BOTH these 2 very critically important features:

1] The glide/portamento is exponential (NOT linear). e.g. The glide should slow down slightly as it approaches the target note.

2] Retrigger on/off, allowing the choice of whether "slurred" notes re-trigger the filter envelope, or not)

Try playing some of Keith Emerson's famous synth riffs with, and without, those features, and you will see how critically important those features are.

Amazingly enough, the Dreamstation (that has been included with Sonar for over a decade) DOES have "exponential glide (portamento)", BUT NO "retrigger option".
I expected the Arturia Moog Modular V to have these features (because it should to be authentic). But the demo that I just evaluated, while it does have "retrigger on/off", I am NOT hearing the classic "exponential glide" (e.g. when trying the "Lucky Man" riff, Dreamstation sounds "more like the record" than Arturia Moog Modular)

I googled this subject many times, and it seems that only a few people (including manufacturers) understand this issue.

So, again, does Cakewalk, or anyone, make an analog soft synth that has BOTH of those critically important features?

yes this is a very key point in terms of being authentic and I think kurzwiel had it down.

I don't know, but two synths you may want to look at, if you have not done so already, are  AAS's Tassman and Native Instrument's Reaktor Reaktor is a very complex beast if you dig into it. It may be worth posting the question the Native instruments forum.

You can demo Tassman.

Another posibility if you are not allergic to iLoks or elicencers is XILS labs XILS3 - the full version has "a Voltage Processor (for increasing the modulation shapes)" Given the extremly versatile routing of this synth hooking the voltage processer up to the key output may, or may not give you what you are after.