For several reasons, it would be very helpful in MuseScore to have the option to temporarily ignore any inserted line and page breaks, or to remove all line and page breaks in a single command. This is especially true when entering/editing lyrics and chords, or inserting measures.
I often develop lead sheets that eventually find their way onto the Wikifonia web site. When I create the lead sheet in MuseScore, I very carefully place line and page breaks, in combination with various amounts of measure stretch to insure a well laid-out sheet for my own use.
However, when uploading my sheet to Wikifonia, it is usually (but not always) better to remove any line and page breaks from the resulting MusicXML file and allow the Wikifonia rendering engine to determine the appropriate line and page breaks, and measure spacing. Often, the line and page breaks in Wikifonia will vary depending on the size of the sheet that is selected.
However, removing all the line and page breaks from a MuseScore score for this purpose is really tedious. It would be much better to be able to either temporarily disable line and page breaks (preferred), or to remove them all at once (in a temporary copy of the score).
I know there is a plug-in which inserts line breaks every 4 measures (aka Real Book style). Possibly this plug-in could be modified to perform one of the functions that I have described here.