I have run several things in my transmission (95 e320) such as lucas stopslip, and even some pumpkin juice (diff stop slip) and it has improved it (I need a new tranny, I'm just getting the last life out of this one before I install the rebuilt one). It is livable now, so if you want you CAN put the stuff in. In my experience on the forum, most techs here advise against additives.

If it were my car, I would drive it. I would steer my wife away from it if possible so that I could keep tabs on what the tranny was doing all the time until I was sure it was solid. If it does give symptoms, you will be the one experiencing them and can relay to the smarty pantses (not me, everything I know I learned here) here exactly what happened.

On a side note...how are the shifter bushings? A really bad shifter bushing will actually keep it from going into gear until monkeyed with.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg