A mount system added to mmorpg game

Hi I have a mmo server and would like to add a mount system into the game so players can ride on a mount and will increase movement speed in game and users can fight while been on there mount, the game uses [login to view URL](emulator) there are no current mounts and will be custom ones added to the games once system is in place I am not sure if this would effect the system or not. Kind regards