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With a torn boot you will be getting dirt on the rack shaft - the dirt is abrasive and will scratch the shaft. Scratches will help ATF escape the high pressure chambers - you'll get leaks. How long - don't know, but racks are expensive. If yours is good (not leaking externally, does not vibrate when you turn wheels) don't risk it.
Yes, toe-in adjustment is recommended after disassembly of steering components. If you mechanic is careful, and will be putting back the same tie rods, he could count number of turns it takes to remove a ball joint on the end of tie rod and put it back with the same number of turns. Assuming he keeps the tie rod from turning.
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