To change the title, you can use the mobi2mobi script found elsewhere, it's a command line tool - both .mobi and .prc file will work
Just open the command line (in the directory with the script and the books you want to change, type mobi2mobi.exe and pick the [option] of your choice.
title and updatedtitle are the once I suggest, you may also define an output file, if you don't want to overwrite the oiriginal.
As for the book opening with the cover page: if you use (or used) mobipocket creator, and did not insert a start_reading tag, from my experience the book opens with the cover page. The problem is, that once you start reading, the next time the book opens with the page last read. You could got to the cover page before closing the book, but than you have to remember the position or chapter you were reading for the next time.