Sounds like many of those problems were fixed in the official patch (1.1). Here are the list of changes:
Quote:
* Added a detail setting to improve performance on lower end (dual core) machines
* General performance optimizations
* Addressed audio stuttering issues
* Optimized in-game cloth handling
* Optimized in-game tree leaf handling
* Addressed options disappearing briefly after pressing [Esc] at the Main Menu
* Addressed flashing placeholder text
* Added additional controller support:
o Xbox 360 Controller for Windows
o Xbox 360 Wired Controller
o Logitech Rumblepad 2
o Logitech Cordless Rumblepad 2
o Logitech Dual Action Controller
o Saitek Cyborg Rumble
o Saitek P32 Rumble
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Apparently there is a "trainer" out there that lets you save anytime
(as well as toggle on various cheats).
Sadly I can't share where to get it here, because it may use a hacked EXE file.
(Use any unofficial tools at your own risk, of course)