I have Steem 3.6.3 running on OS X. The key is to use a Wine shell that allows you to select the Wine engine version that you want to run. I have found that Wine 1.3.25 works fine with Steem. I use Wineskin (another free OS X Wine shell). If you pick a later Wine version (1.4 or later), the Wine project took out some graphic hacks that may help many other programs but break programs like Steem.
My preferred paid Wine option is Codeweavers' CrossOver Mac product. I know they support the Wine project financially. Unfortunately, I cannot choose my Wine engine version in CrossOver so I fall back to Wineskin (http://wineskin.urgesoftware.com
) when I have a Windows program that needs a specific version of Wine. I like Winebottler's interface better, but it hasn't been worth it to install another free Wine shell.
I just played Lethal Xcess in Steem turning auto frame skip off. I used display every frame and it seemed fine to me. However, I am running a late 2013 iMac (2.7 Ghz Core i5 with Intel Iris Pro integrated graphics).
I would not give up on Hatari gaining pasti support. As an OS X user, that is my preferred ST emulator (sorry, Steven).