Hi,
With MPF on the ASA, this should be possible. For example:
access-list 100 permit ip host x.x.x.x any
class-map ONEUSER
match access-list 100
policy-map MAXUSERCONNECTIONS
class ONEUSER
set connection per-client-max 10
service-policy MAXUSERCONNECTIONS interface inside
Regards,
Arul
*Pls rate if it helps*