Capture mouse by default.

captureMouse.reg

@@ -0,0 +1,5 @@
+REGEDIT4
+
+[HKEY_CURRENT_USER\Software\Wine\X11 Driver]
+"GrabFullscreen"="Y"
+

default.nix

@@ -8,7 +8,8 @@
   wineGlobalEnv ? [ "DXVK_STATE_CACHE=0" ],
   winePatches ? [ ./patches/joyaxis.patch ],
   virtualDesktop ? null,
-  registryFiles ? [ ]
+  registryFiles ? [ ],
+  captureMouse ? true
 }:
 
 #check wether string is two positive integers separated by x
@@ -36,6 +37,10 @@ let
     name = "win10.reg";
     text = ./win10.reg;
   };
+  captureMouseReg = pkgs.writeTextFile {
+    name = "captureMouse.reg";
+    text = ./captureMouse.reg;
+  };
   script = pkgs.writeShellScriptBin binName ''
     #sane bash
     set -eo pipefail
@@ -70,6 +75,8 @@ let
         mkdir -p "$launcherCachePers" "$WINEPREFIX/drive_c/users/$USER/AppData/Roaming/"
         ln -s "$launcherCachePers" "$WINEPREFIX/drive_c/users/$USER/AppData/Roaming/"
 
+        ${lib.optionalString captureMouse ("${regEdit} ${captureMouseReg.text}")}
+
         #apply custom user registry files
         ${lib.concatMapStrings (x: "${regEdit} " + x + "\n") registryFiles}