Yeh lockon is great although as said it runs pretty poor even on a hardcore rig, but the best thing to do is to print off all the controls for the keys cause theres alot to understand and some need like Ctrl+Shift+A for stuff and Ctrl+Alt+A for something else, i sat on the parking area for about 10mins once trying to find the engine start key, as for the weapons system thats another story all together and after like a few days not playing it i pretty much forgot all the keys and had to go thru all the **** again so i printed the key mappings off which was something like 5 pages long.
Hell and Fire was spawned to be released.