Uhm, guess its time for me to start posting helpful stuff. Reading this board mindlessly is getting old and I need a hobby.
Alright, buddy, assuming you're using Drako's script: click add adress manually (CE) and then fill it like this:
Adress: MobRunSpeed
Description: N/A (put whatever you want here)
Type: Float
Then hit OK.
After that, check the box and edit the value to whatever mob speed you want. Default is, as you said, ten.
By the way, the same method applies to your character's speed. Do exactly the same, but instead of using MobRunSpeed as the adress, use SpeedValue.
So yeah, thats it, feel free to thank me. I wont moan if you dont do so.
If you still got any kind of issue, please reply back.
Note: Adresses are case sensitive, type them exactly as I did, using mayus.