From version 1.5 on the auto configuration is supported:

[Settings]
IPPOOL_0=123.45.56.78-90
IPPOOL_1=123.45.57.0-254
IPPOOL_2=AUTO

The above enables three IP pools for DHCP clients. Unknown clients are automatically configured by adding the appropriate client sections to the INI file. IP pools of size 1 (e.g. 123.45.56.78-78) are allowed and are very useful if you want to assign the same IP address to all clients.
The new feature in V1.8 is: AUTO. If AUTO instead of a numerical IP-Pool configuration is used then the IP Pool is automatically chosen to cover the complete IP Range based on the IPBIND_x IP address and the network mask. This works best together with a name based IPBIND_x configuration.

From V1.9 on the IPPOOL_x numerical IP-Pool definition is enhanced with a comma syntax. This allows to define IP pools such as:

[Settings]
IPPOOL_0=123.45.56.78-90,92,94

This adds 123.45.56.92 and 123.45.56.94 to the IPPOOL_0.

Since V2.3.1 it is also possible to define a class A/B network by using IPPOOL_1=10.45.3.1-10.45.5.254. This defines, in accordance with the subnet mask, all IP addresses from 10.45.3.1 through 10.45.5.254 as the IP pool.