Duplicate Rewards for Computer Hacking:
It is possible to duplicate the rewards (XP, credits, and stop/nuke items) that you get for hacking a computer. To do this you need to save before hacking a computer and while you are on the 'access granted' screen reload your save (do not press the 'ok' button) and hack it again. This can be repeated as many times as you want per computer but failing or aborting a hack will reset the stacked up bonuses.
Keep upgrading your Hacking and Strength until you can pick up turrets as they contain unlimited ammunition. You can either set them down or allow them to fire while you move. This can also be done with robots.
Items that you throw on the ground will remain there even when you leave the area.