questions on grsec and pax

Sorry for the number of questions.
Is turning off EMUTRAMP on modern systems ok?
Is weak UDEREF backed up with RAP and KERNEXEC as safe as a kernel with strong UDEREF in practice?
Is turning off EMUTRAMP on modern systems ok?
Is weak UDEREF backed up with RAP and KERNEXEC as safe as a kernel with strong UDEREF in practice?