If you tried to add peds to GTA 5 you may have faced the game crash issue when loading story mode, this is what you can try to do to FIX this issue (you can watch the tutorial here if you want):
1 - Download and install this mod, its a .ASI script so, you need ASI Loader installed, extract the file to your gta5.exe folder:
2 - Download this mod
Open the ZIP file
Open the folder "Gta Config For v 1.0.1604.0"
Open the folder "1x traffic 1xpeds (Means Gta base)"
Extract the file "gameconfig.xml" to your desktop.
Now open the OpenIV app and navigate to: mods\update\update.rpf\common\data
* Important: If you don't have the file in mods folder you should navigate to:
"update\update.rpf\common\data", click in the button "Edit mode" and then click in the indicated button to Copy the file to mods folder. *
Click in the button "Edit mode"
Click in New
Click in Add
Select the gameconfig.xml that we extracted to desktop in previous steps and click in Open
Done :)
If all goes well now you can run your game with more than 10 added peds :)