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Not really. Adjusting the idle mixture just lets the engine run properly. You won't get enough airflow under the slide to create enough vacuum to lift the slide until you have the throttle about half-way open. That is hard to do with the bike sitting still, you need to be moving to do that.
Look at this picture of the carb, you might understand a bit more how it works.
Air enters from the airbox on the right. A tiny portion of that air goes through the pilot air jet in the lower-left corner of the throat (shown in the picture) and goes past the needle to the tip of the pilot fuel jet. There, it mixes with fuel that has come from the bottom of the float bowl, through the main jet, then through the pilot fuel jet and becomes the pilot mixture. The mixture then travels through a passage to another passage that is above the throttle butterfly. There, you can see that there are multiple openings into the bore. One is on either side of the top of the throttle butterfly (sometimes there are a total of three holes there), another one is out a bit, closer to the engine. That one has a screw in it so you can adjust how much flows through it. The one hole near the butterfly that is always open can not supply enough fuel for the bike to run, so you need to add some with the screw adjustment. The other hole(s) will be uncoverd as the throttle is opened just a bit, they will provide additional fuel to the mix before there is enough air flow to drag fuel past the needle and, eventually, the main jet.
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Look at this picture of the carb, you might understand a bit more how it works.
Air enters from the airbox on the right. A tiny portion of that air goes through the pilot air jet in the lower-left corner of the throat (shown in the picture) and goes past the needle to the tip of the pilot fuel jet. There, it mixes with fuel that has come from the bottom of the float bowl, through the main jet, then through the pilot fuel jet and becomes the pilot mixture. The mixture then travels through a passage to another passage that is above the throttle butterfly. There, you can see that there are multiple openings into the bore. One is on either side of the top of the throttle butterfly (sometimes there are a total of three holes there), another one is out a bit, closer to the engine. That one has a screw in it so you can adjust how much flows through it. The one hole near the butterfly that is always open can not supply enough fuel for the bike to run, so you need to add some with the screw adjustment. The other hole(s) will be uncoverd as the throttle is opened just a bit, they will provide additional fuel to the mix before there is enough air flow to drag fuel past the needle and, eventually, the main jet.
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