Systemwide modifications through system framework not possible ?

[Greatz08]

Instead of hooking apps, is there no way to hook all values systemwide through system framework or similar system app ? So that whole system can show that spoofed value ?

[AxoXg]

It would be a lot stealthier too (less hooking detection)

[Android1500]

Instead of hooking apps, is there no way to hook all values systemwide through system framework or similar system app ? So that whole system can show that spoofed value ?

Thinking about that btw nice idea maybe be can hijack system_server