Idle timeout exemption ..

[FTPServerTools]

The standard sitekill in the downloads is the one you need. Read the accompanied text file, it mentions:
This is a simple SITE KILL command for ioFTPD 5.x.
Use it as follows:

Parameters are any combination of
The following needs a string to compare and uses =, ==, !=
.....

The sitekill4x version will not work properly under 5.x