Wine+WInbox are also running well on my Ubuntu laptop.
The only problem that I found is when I open the MT's terminal window on winbox that is running on wine, I cannot see its full screen correctly (long lines are cut off). If type something like "ping 192.168.1.100", I cannot see what I'm actually typing. And the ping results are also cut off so that I cannot see the ping times. Try it if it also happens with your Wine+Winbox configuration.
Any ideas how to fix this? This issue must be related more to wine rathern than to MT.