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Most Glocks I've seen in IDPA competition will automatically drop the slide when you slam the mag home; no need to manipulate anything.
Do Glocks have ambi mag releases? Or, reversible? If so, try dropping the mag with your trigger finger. Two benefits: Your finger is plenty long to hit the release without shifting, and you can't possibly have your finger in the trigger guard if it's busy hitting the mag release.
That said, most shooters do have to shift their grip to reach the mag release with their thumb. Watch a video clip of Rob Leatham some time; he tosses the gun around hard to reach the button, then flips it back as the mag is seated.
It can be faster to drop the slide using the slide release, but I've found for consistency's sake, slingshotting can be "better". No need to learn where a particular gun's slide release is, just grab the slide and go, regardless of make or model.
IDPA doesn't want you to save your empties, they want you to save the rounds in a partially-depleted magazine, if you are performing an "administrative" reload. If the clock is running, you'll be doing slidelock reloads almost exclusively. You may still find retention reloads specified in shooting drills (classifier match, and other), so they should be practiced.
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