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1) Typically, a down pipe has the largest effect on turbo response. However, combining that with an intake and a tune will increase that effect even further for each component added.
2) I assume you have the 8-speed automatic. If so, then that won't do really any harm if you do it for a short duration. There is a term for it, 'brake boosting'; kinda like a pseudo launch control.
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PC: i5-6600; RX 480 4GB; 16GB DDR4; Samsung 950 PRO 512GB SSD
Car: 2016 Camaro 2LT RS 2.0T 6M Blue Velvet Metallic | ZZP Hi-Flow Catted Downpipe | Injen EVO7300 Cold Air Intake |