Seating by standings or random?
random seating is useful for competitive seal deck. I want players to be seat randomly. So, players who sit beside are not their close friends. If they are close friends maybe they exchange cards or give an strategic advise during construct their decks. random seating can mitigate this risk.
seating by players are useful for collecting the decklist. decklist are sorted by lastname. more useful for competitive constructed tournament.
For prerelease, I seat by name but let players construct their deck with his friend after I made tournament announcement. I hope they are not exchange cards. :D
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for pairing,
default is random pairing. it useful for round x-1 or x-2 (x is the number of rounds in tournament) sometime players just pretend to play and wait until they know match outcome of that nearby table. random tables force player to start play without information from beside table.
seating by standing is useful when you have judges to cover the floor area and can listen player talking during x, x-1, x-2 rounds. :D