No, don't fix it. The lists in rules.ini are used to build an internal table when the game is running that many triggers refer to (except the units and infantry that only one trigger refers to respectively). Basically the internal tables are lists of every valid entry in order (thus if entries are missing, lower ones getshifted up to keep the number sequnce unbroken). If you change the relative numbering and order, you will cause the wrong anims to be called by triggers where they are used in missions or on maps. You can replace existing ones that don't have a valid animation associated so long as the numbering remains the same. The same goes for buildings. Vehicles and Infantry both have one trigger that takes the value from the internal table, but I don't think it ever gets used. BTW, if you add houses to the game, that will screw things up too and the missions won't work. Try porting a mission from RA2 to YR where they added a house and see what I mean.
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