Let me preface this that I understand the need to maintain the general configuration of the Wine prefix.

However, for those who are willing to dig in and solve some issues that are specific to some games (Dark Souls II mouse issue can be solved with a virtual desktop set via winecfg), it could be very useful. This functionality can be openly stated as unsupported, and if used on technically supported titles there is no guarantee of the behaviour.

I'm going to be making a small edit and submitting a PR, but thought I'd throw an issue for reference first. Let me know what you guys think of the idea!