Random:
places players on the map's starting points randomly.
Starts with first player than the second is places as far away from the first and so on.
(i don't know how possible it is to calculate the best point if there are already several players placed but i guess it would calculate the overall furthest point from all placed players from the available points that are still not taken or just the furthest from the last player tha twas placed,either one would work.)

Fixed:
places players on the map's starting points bases on their ID number.

Can we have this please?

Related idea, use the drawn start boxes but you have to pick a start position contained within it rather than any point within.

Also random positioning like in Starcraft maps with many start positions for example. Whatever number of spots, and the players both get a randomly assigned one of them, so they dont know where the other is starting before scouting.

Yes...
This would also allow games to easily prevent lab sharing and all sorts of other cheesy tactics if the players are not interested in them.

That should already be possible using the LuaRules AllowStartPosition call-in.

this is very mod specific since each mod has it's own set of resources

springlobby does this since years