complex yet interesting chalange

here is my projects

in the 22 unit warehouse building (kinda like a university dorm) i have
to supply the internet, BUT not allowed to run wires to every room do to
the fire inspectors

so i will have to partially do at least 2 wifi antennas and some lan
hookups

i use a computer with ICS instead of a router to supply IP's (for
bandwidth management reasons)

problem1 :
they all have to be on the same subnet, in other words i can not just
run wifi routers that give out new sets of IP's

how do i do that ? can i use a wifi router like i would a wired switch
? what option is that in the routers settings ?

an alternative option would be to have 1 NIC card and 2 wifi cards in
the ICS computer, again not sure how to tell ICS to use 3 network cards
for ICS output, is that even possible ?

problem2:
for bandwidth management and monitoring i try to use Antamedia
Bandwidth Manager V1.0.0 (full version, not trial)

reason is in this building we have only a DSL 2000/800 available, and
if someone is using utorrent full blast every one else is not getting
even a page open

is there a better solution to do this with ? i cant get that to work as
of yet, it wont even monitor any traffic outside the computer its
installed on, not alone having the option to limit traffic to each IP or
MAC individually

tried netlimiter , that i had even less luck with