From RC Helicopter Wiki
It is used to practice autorotations, and as a safety measure (especially on electric helicopters) to help prevent accidental spool up, and also to help lessen damage in a crash after the pilot suffers brain fade.
The throttle position used by throttle hold is configurable. Depending on the transmitter, it may be affected by the throttle trim.
The following applies to electric helicopters:
It is advisable to set your throttle hold at -5%. This should compensate for any throttle trim that may be set to achieve an effective 0%. If you have digital throttle trim, this may not be necessary.
If your electronic speed control (ESC) features a soft-startup and governor mode, you can simply use throttle hold to start and stop the motor like an on/off switch. Throttle curves should be the same % for each value from low to high throttle stick, for that particular flight mode.
This example uses 5-point throttle curves: Normal Mode (50-50-50-50-50) for hover practice or landing; Idle 1 (75-75-75-75-75); for sport aerobatics; Idle 2 (90-90-90-90-90) for sportier/3D aerobatics.
This is actually a safety feature because there is only one case in which the ESC will arm, and that is when throttle hold is engaged. It is easy to bump the throttle stick which can inadvertently cause the motor to spin rotor blades when you're not ready for it.
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