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By default the port is 1337, which should be customisable in the ini file.

The headlight corona found in ...pctexturescoronas.wtd was essentially removed. You'll have to restore a backup to get the original corona back.

Yes, they all use this handling line - 

STOCKADE     6500.0  4.0   95 0.0 0.0  0.1   0.0  5  0.12  1.0 120.0 0.15 0.68 0.2  35.0 1.00 0.75 14.4 0.15 0.48   1.0  0.8  0.7  0.20 -0.25 0.0  0.5   1.0 0.3 0.5 1.5 0.15 40000 8 8300000 2

It really isn't difficult to get it working.

You just have to install gta like normal, and then you need the latest Games for Windows Live client. The one that normally comes with GTA is outdated and doesn't work with Win 8.

However, I would be very hesitant about trying to play GTA on they laptop. That's not a gaming laptop in any sense of the word and it doesn't have a dedicated graphics card, from what I could see online. You'll have to settle with running GTA on the lowest settings, and you probably won't be able to mod it much.

You should go with V5R2, as it is an improved version of V5.

Reinstalling is best because that's the only way to get the tazer installed again (without having to go through and try installing it manually).  
 
You could just copy the scripts folder, but you also need to copy advancedhook.dll, scripthook.dll and scripthookdotnet.asi from the main GTA folder.  Note that you won't have a tazer this way.

ELS doesn't have any add-ons that allow for drivers to pull over for lights only.  However, you can press / to trigger LCPDFR light modes (they don't actually show up) so it is the same as having drivers pull over for your ELS lights.

Hello and welcome!
 
You need to press Shift when behind a vehicle and inside a police car to initiate a traffic stop.

Hello and welcome!
 
In order to conduct a traffic stop, you need to press Shift while in a police car and facing the suspect car.