You can edit the values yourself and its quite easy actually. But unfortunately you cant edit run speed only, so the changes will effect marching speed too. I believe the Realism mod has done it the same way.
Locate the txt file descr_battle_map_movement_modifiers in the Total War\Rome - Total War\Data folder.
HTML Code:
climate default
grass_short 1.0
grass_long 1.0
sand 1.0
rock 1.0
forest_dense 0.75
scrub_dense 1.0
swamp 1.0
mud 1.0
mud_road 1.0
stone_road 1.0
water 0.6
ice 0.5
snow 0.75
By reducing these numbers you will reduce the overall movement of all units. A 25-30% reduction will make the runspeeds more like the STW/MTW run speed.
Make a backup of the file and edit the values until you found something you like.
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