If i wanted another bitcoin wallet along with my own can I redirect it so it uses the same data directory but not the same wallet address?
No, the wallet.dat is part of the data directory, but you can create shortcuts for differently named wallet files.
E.g. create a shortcut with -wallet=sho_work_wallet.dat and another one with -wallet=sho_play_wallet.dat. The wallet files can be in the same directory and the blockchain data will be shared, but depending on the shortcut you use you will open a different wallet. It might take longer though since you have to do a quick rescan. That rescan takes ~1-2 minutes on my i5 3.2Ghz w/ SSD.
