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I was hoping to get some input from other players regarding to-hit modifiers. This is an example I found:
Sequence of Events
1) Standard rolls.
2) Distinguish failed from passed.
3) Re-rolls
4) Apply Modifiers
5) Check Statements
Scenario
A Space Marine (BS3+) is firing at a XV95 Ghostkeel Battlesuit.
The Space Marine is using a plasma gun.
The Space Marine is benefiting from a re-roll all failed to hit rolls.
The Space Marine uses the supercharge profile of his plasma gun.
The Ghostkeel is more than 12" away from the Space Marine, thus the Space Marine has -1 to hit rolls.
The Ghostkeel is also within 3" of a stealth drone, giving the Space Marine another -1 to hit rolls (Total of -2 to hit rolls)
Scenario - Sequence of Events
1) Standard rolls: As the Space Marine pulls the trigger, for the sake of this example, lets say he has 6 shots and every possibility from the to hit roll is rolled (1,2,3,4,5,6).
2) Distinguish failed from passed: Being BS3+, the Space Marine theoretically misses (1,2).
3) Re-rolls: The (1,2) dice are re-rolled, the result being are (4,5). Having (3,4,4,5,5,6) as the new result.
4) Apply Modifiers: From (3,4,4,5,5,6) the modified result is (1,2,2,3,3,4) due to -2 to hit rolls.
5) Check Statements: The Space Marine managed to land 3 shots (3,3,4) however the (1) which was previously a (3) did not get re-rolled since he did pass the test, but after the modifiers turned into a lethal (1). Due to the supercharge rule, the model is slain.



That would mean that supercharing plasma is dangerous as hell. All heavy tesla on Necrons fliers can never get a "tesla-hit" since the always have to move and have a -1 to-hit.... I´m sure there are more examples but there are just the ones I can find right now.

Sounds correct.

Supercharging is not the default setting, it's an optional situational setting.

Necron Tesla weapons are Assault, not Heavy so no -1 for moving.