nope. Only did full power tests.
I just did the exact same test, but a bit differently, and I don’t think the differences matter that much. Read on if interested:
Armchair flight test 1:
Shivering cold and dark, at some random gate at KSAN. Used the video-game fuel-n-balance window to load the “problem” plane (baron g58) with 100 percent of total fuel. Parking brake on. Weather: default ‘Clear skies’ preset, which sets wind to 2 knots from 272 which I never changed. Prop and mixture levers fully forward, throttle lever fully idle (read zero). Started both engines, waited 10 seconds. Now I see the default rpm is stuck at 930 rpm.
Released the parking brake.
Aircraft doesn’t move at all. I can make it move by pushing the throttle levers forward slightly to increase the rpm to 1000 or something. And then it starts to move and I can step on the brakes to bring it to a complete stop and wait for the rpm to go back to 930 rpm. I can release the brakes now and plane wouldn’t budge. I can again push the throttle levers a bit to make it move…and rinse and repeat.
Armchair flight test 2:
Repeat everything in 'Armchair flight test 1, but load the plane up with only 15 or 20 percent of total fuel (or the sim’s default, 50 percent of fuel) this time. Soon as you release the brakes after starting both engines and verifying that the rpm is at default 930, the plane starts to move on its own, and will reach a maximum 40 knots without ever touching the throttles if left unchallenged.
Physics? More fuel means more weight? Less fuel means less weight? 
I had default fuel at 50%, and it did not move by itself at idle throttle, unless there was a ~40kt tail wind.
Interesting. Cause in my tests, fuel at 50 percent will always make the plane move at idle (zero) throttle and 930 rpm. I forgot to mention that for passengers, I left it at default too, which is: two pilots in the front, each weighing 170 lbs. Did you do your test with the same simulator default pax count and weight configuration or did you change them to something higher?
And watching this video from Pete, I get the impression that one isn’t supposed to keep the engines idling at anything less than 1000 rpm when on the ground? He’s idling at something like 1000-1100 rpm with brakes set to on, and after he gets permission to taxi, it seems like he simply releases the parking brake and the plane starts to move forward on its own without him having to increase the rpm/throttle at all. He’s flying with full tanks too:
Yeah, I went straight in, with no changes at all.
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This AvWeb article recommends 700RPM to avoid excessive use of the brakes during taxi -
Another common taxi mistake I often see is carrying too much power and riding the brakes to control taxi speed. This is especially common in twins, because with two engines running they have considerable idle thrust. Rather than using 1,000 or 1,200 RPM and having to ride the brakes, try 800 or even 700 RPM for taxi. This is especially important if you’re taxiing downwind (which is normally the case if you think about it) or taxiing on a downgrade.
This pilot review of the G58 states that it can be taxied at idle - We Fly: Beechcraft Baron G58 - FLYING Magazine
The trick when taxiing the G58 is to be sure the throttles are back at idle to avoid riding the brakes
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I have also seen this issue in the Carenado P44.
Fixed as of Sim Update 3.