No, your opponent will also need to have exactly the same ini files as you in order to play it. If you use a map.ini, then your opponent can automatically download the map and said map.ini or map skirmish scripts, without having to having to succumb any adverse effects of toying on other maps, or being prevented from playing normally without having to bugger about with files in the BfME directory.
The tag "MP" refers to that it's used in skirmish and multiplayer - but altering any of these, and online servers will deny you the ability to play against standard online players.
The point is - there's no ini editing involved using skirmish scripts, thus it can be applied happily to a single map, or using a map.ini to multiple maps.
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