As of version 5.7.5, Webshots can fit imported photos using the control in Settings->Application.
Imported photos are fitted to the screen as follows:
If your photos cover the screen and seem "too big", select Letterbox.
Unfortunately photos imported before version 5.7.5 will need to be reimported to use this new system.
This settings can be found under Settings->Application->Imported Photos Fit.
Please take advantage of the new import directory function to make this easier.