touchpad enhancement: adjustable cursor speed

```
in trackpad mode, allow variable/user-adjustable tracking speed (and maybe even
acceleration) of mouse cursor
```

Original issue reported on code.google.com by `george.h...@gmail.com` on 14 Jul 2010 at 4:05

Start by finding the Android VNC viewer code path for trackpad mode and mouse cursor movement. The issue asks for variable/user-adjustable tracking speed, with acceleration only suggested as optional, so done means trackpad cursor speed can be configured by the user.

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