I have not seen any third-party GUI front ends for XImage yet. Do I have to do it myself? In the meantime, you'll need to keep familiar with the command line arguments offered by XImage. Below is a quick break down:

/append = Appends a volume image into an existing WIM file
/apply = Applies a volume image to the specified drive
/capture = Captures a volume image into a new WIM file
/commit = Commits the changes made to a mounted WIM
/compress = Sets compression type to none, fast or maximum
/config = Uses the specified file to set advanced options
/delete = Deletes an image from a WIM file with multiple images
/dir = Displays a list of files and folders within a volume image
/export = Transfers an image from one WIM file to another WIM file
/info = Returns the store's XML descriptions for the specified WIM
/mount = Mounts an image, with read-only access, to the specified directory
/mountrw = Mounts an image, with read-write access, to the specified directory
/ref = Sets WIM references for an Apply operation
/scroll = Scrolls output for redirection
/split = Splits an existing WIM file into multiple read-only WIM parts
/verify = Verifies duplicate and extracted files
/unmount = Unmounts the image mounted to the specified directory
/? = Returns valid command-line parameters for XImage

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