Please, change the save location to a user based folder, so each user can have its own save.

There might be a work-around. The game stores its saves in its game folder.
If you're using Windows Vista or newer, install the game somewhere into C:\Program Files\ and start it without Administrator rights. Now the game doesn't have the right to write its saves in its folder. Every write access will usually be redirected to C:\Users\<USERNAME>\AppData\Local\VirtualStore\Program Files\<PROGRAM FOLDER>\
Thus you're able to have different configurations and saves for each user (as long as non of them uses an Administrator account).

I didn't try it yet. I'm used that my user has admin privileges, and I'm not willing to change that or make a new user just to play a game. I think the developers could easily make a quick fix.