heres the best way to setup your custom hotkeys:
https://www.reddit.com/r/WC3/comments/69p3nv/improved_custom_hotkeys_setup_by_wtvr/
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Larger control groups or “select all” is a bad idea (which has been discussed at great length in many threads) heres a better way to improve hotkeys without drastically changing the gameplay: Preset Control Groups- https://us.forums.blizzard.com/en/warcraft3/t/pre-set-control-groups-in-options/
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but that would cause players who are new to multiplayer to be very confused or even upset as to why the multiplayer aspect is so drastically different from campaign. I dont think its right to teach players to play one way and then change it for competitive play. IMO having unlimited unit selection would only be acceptable for custom maps and gamemodes