i plan on Running Rise of Tiamat in the future, but i doubt i will get the 5 players the Adventure is designed for, most of the group got annoyed by my giving them NPC henchmen and i don't know how to rebalance the encounters for 2 or 3ish people. i would suggest each of them running 2 characters apiece and later on being able to recruit a companion. but i don't know if that would be enough,
i gave the level 1 feat optional rule, savage worlds style bennies that can be used for rerolls on d20s, 32 point buy, some free healing potions and a DM chosen background boon (equal to a feat your DM assigns you) to hopefully balance things out. well, the DM background boon is usually a racial feat or something that gives extra proficiencies.