Braveheart

I'm still working on this and it has come on a lot since my original post. It remains a private modification for the time being, I have no estimation for a public release at this time.

Incorrect, a Sheriff in Scotland is a Judge. http://www.scotland-judiciary.org.uk/36/0/Sheriffs Police Officers and Security Guards provide security in court.

The scripts most likely. The scripts must be optimised as much as possible for the multiplayer environment. Many scripts are not. My advice would be to check your "reliability monitor" and see why GTAIV crashed. If it shows "GTAIV.exe" then to my understanding this is due to data files (e.g. models, vehicles, common/data and .asi mods) If it shows "ScriptHook.dll" then again to my understanding a script caused the game to crash. Also check your "ScriptHookDotNet.txt" file for any script errors prior to the game crash. Also be advised that you cannot, in a modded multiplayer game, climb on any object, jump or get hit by/hit other players with vehicles as all of the above has a high tendency to crash either you or someone else.

Incorrect, in the United Kingdom it is celebrated in March. http://en.wikipedia.org/wiki/Mother's_Day#Dates_around_the_world

I'm not seeing anything in the log which ties it to anything specific. Note LCPDFR Pullover is crashing too. Perhaps you have a conflicting key (with shift)? The Policing. Policing.Tick is only called when you are available and handles spawning calls, so I can't understand why it's crashes if you're not available. The only recommendation I can give is to try reinstalling LCPDFR and the script. If that fails, try a full game re-install.