You ain't gonna get this. You'll have what it calls "Memory for installable applications" at 22 Gig, so that'll be bigger. But the main mem, ain't gonna change, it can't be resized...

OK, good, cause you're gonna be doing some heavy reflashing

Use vi as editor, it's allready installed on the N900, it ain't for the meek, so be sure to google up some intro guide on how to use vi to edit stuff.