Can I make a DHCP superscope range as perffered?

Hello,

I had this issue, which I fixed by using just 1 full IP range in DHCP. (x.x.x.0 -255 \24)

http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/f97232a8-81c6-4fa6-9e18-4f8336eb7cd2

I know this is not a long term solution as during peek hours only 5-6 Ip's are remaining in the pool.

can I add another range with lesser IP and do some setting which would ensure, this range would only b used, when 1st get full.

I had tried to add this range as superscope but it gets added as primary and DHCP uses both ranges to assign IP.