While I applaud the idea there are some general problems with scripts like these:
- Hacky Implementation
The game is not native to SA:MP. You'd have button issues, camera issues and latency issues. These kind of scripts should be done on the client and not run 100% on the server. - Resource Hoggers
In order to counter-act the hacky lookingness (probably never 100% for everyone) you'd have to increase the rates at which the server send/receives information. It could also lag the server depending on the complexity of the script: it's a client script on a server, the chances are it will cause undue lag. - Overly Simplified
There are a limited set of functions in SA:MP and these are very complex systems to get right. It's evident in this video that SA:MP has limited the potential of this script.
These scripts are more suited to RP servers, where everything is needed to act out a role. They would be a gimmick in our server and only used every now and then. In my opinion it's not worth the implementation/bug testing time to implement a possible ghost feature.
VC-MP: 
