You do indeed, in the mapinfo file. I suggest you read Docs/mapping.txt, it's a very important step in mapping, if you want to do things right. What you want is explained in Appendix A.
Now for my opinion in this subject... I would not do this if I were you, modified balance settings is something not everybody likes on their server (be it players or admins), so admins have the possibility to disable map-specific modifications using the g_mapinfo_settemp_acl cvar.
So, don't count on settemp to make your map playable.