You can use the Shortcut dialog to access most of TimeSnappers frequently used features. By default it can be invoked using the keyboard shortcut [Win]+S (no matter what application you are using at the time, i.e. a global shortcut).
Then you will be presented with this dialog:
If you now press e.g. "B", that will show the Day browser dialog. "O" will open the options dialog etc.
It is possible to change this default shortcut of [Win]+S in the options dialog -> Options tab -> "Global Shortcut" field, e.g. to [Win]+A which will soon be the new default since newer versions of Windows have "stolen" the [Win]+S combination.