You can change the following default styles – you do not need to set these if you want to use the default values:

Transspeed for displaying images: plugin.tx_mwe2gallery_pi1.transspeed = 500 (500 is default!)

Fadespeed: plugin.tx_mwe2gallery_pi1.fadespeed = 300 (300 is default!)

Max. width of gallery images: plugin.tx_mwe2gallery_pi1.maximagewidth = 600 (600 is default!)

Max. height of gallery images: plugin.tx_mwe2gallery_pi1.maximageheight = 400 (400 is default!)

There is no easy change of gallery width and height (and also thumbs are fixed) in setup possible!! If you want to change  it you have to do this in the codes!