Firmware N600 Wireless Dual Band Gigabit Router TL-WDR3600

hi all... set up is virmin super dud into a wdr3600 with dd-wrt what i want to do is increase wireless signal i have a old netgear g router wgr614v9 can i use this to increase signal around the house and maybe use the extra ethernet connections in a different room ??

I have done this, my main router connected to the VM SH in modem only mode is a WDR3600 btw the 5Ghz is very buggy in ddwrt as it works for a while then stops working, loads on threads on ddwrt on this

back to my main point, I then have 4 wifi routers around the house all hard wired to the WDR3600 - so basically they are access points only. They run a mixture of ddwrt and tomato firmware - also I have 2 subnets - mine and rest of family - I have 200Mb broadband - kids get 40% I get the rest (well I do pay for it)