DHCP Reservations outside the DHCP Range
Currently when trying to assign a static IP for a device through DHCP reservations, you can not enter an IP outside the DHCP range. With my networks in the past I have always set my DHCP range to be .100 to .249, Leaving the end open for switches and the first 100 for dedicated IPs. I know I could just open the range up, but then devices start taking my static IPs automatically, so for example, I use .30 - .39 for ip phones. Assuming I assign 3 phones on day one, if I go to ad a 4th, some other device will have that IP already, forcing me to reset so my reservations get set and everything else gets assigned around them.
TLDR: Allow DHCP reservations within the subnet, but outside the DHCP Range.