1. These values are stored in various files. If you're creating your own single mission, you can open its Mission.xml and alter the value <Cost> in available <Support> fields. I'll asks developers how to make support free in campaign on Monday, but this may involve editing a number of files.
2. MP was removed from Simple Editor because MP inner structure changed (there are only Attack/Defend type MP scenarios in ToW1 while ToW2 and later games support various points to control, etc.) I don't have info about plans to add this functionality back to Simle Editor. I would suggest trying full Editor since it is not very difficult to change an existing scenario, MP or not. You can easily move units, objectives, add and delete units, that's sort of changes. Scripting language is more difficult to use properly, but you don't usually need to edit mission scripting if you are changing an existing MP mission.
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