Oh, right, you probably want to remove that as well.
You'd want to edit mev_title_newgame to load the first map rather than send you to the character creation menu. Most of the "finalize creation" code is in mev_title_ccust_confirm_actually, with most of the character customization effect code in mev_title_ccust_update. You'd want to move the applicable bits of these over to the mev_title_newgame script (e.g. apply the stats you want the player to have, set up starting inventory, do a heal to the new max stats), then copy over the bits related to the room transition and remove the old transition (e.g., load starting coordinates, go to rm_ingame instead of the character editor).