Yes, my opinion is same like you. Actually Transient Period is time how long an Transient IP got no response from subnet scanning and became Available Status.That logic means this period time should be set lower than IP leased time. Each subnet has its own characteristics of how much utilization of IP, and how frequently the user in this subnet move around, therefore you can manually set scanning period and transient period differently for each of them. For example my VLAN 40 has 230 IPs allocated, This subnet has a lot of moved-around users. I set the leased time for 23 hours, scanning period for about 1 hour, and transient period to 0.25 day (the be able setting minimum value). So my IP can quickly become available. This feature is so helpful in case you have number of IPs less than number of users who often move around.
One thing solarwind should consider is lower down transient period to hour not only 0.25 day.