bmp resize is used for album art to resize the cover images.
scrollpad fix should fix something for the scrollpad as the name says. don't know what exactly.
multifont is that themes can contain various fonts and font colours I think.
scroll margin gives wps lines the ability to start at a defined point of the screen and end at a defindes point
with progressbar slider the progressbar can be replaced with an image, sliding from left to right
y-margin lets text be positioned at a definded y-coordinate
hope this all is correct and sorry for my english
