Local Homepage for GoogleChrome

At the moment I'm figuring out, how to use GoogleChromePortable as local Browser for a CD-MP3-playback-system.

• Would it be difficult to add LocalHomepage-functionality to the ChromePortableLauncher?
• As I'm not familiar with NSIS, where can i get help?
• Where in the existing sources to insert this function?
• How to "compile" the exe?
• . . .

Why?

My goal is to provide a huge amount of lectures to an audience, which may listen to them either on PC (via my HTML-GUI), or on MP3-disc-players, regular DVD-sets, or (after copying the files) on MP3-players.
The MP3-format i choose because of its compatibility - so it is beyond discussion.

I decided to use Soundmanger2 (http://www.schillmania.com/projects/soundmanager2/ and http://www.schillmania.com/projects/soundmanager2/demo/page-player/basic...) because of its playlist-functionality completely without the use of Flash.

As i figured out, IronPortable acceps relative paths (for use with autorun.inf) and claims to play MP3s via pure Html5 but does it not fully (see http://jplayer.org/HTML5.Audio.Support/ ; the issue seems to be the different behavior on the canPlayType() method).
So i tested ChomePortable, which perfectly suites my needs of pure Html5-playback of MP3-files (without Flash-fallback).

But there is no way to persuade ChromePortable to accept relative paths.
Do You remember? Start via autorun.inf.

RunLocally=true is in the GoogleChromePortable.ini.
But LocalHomepage=index.html is missing.
Comparing the sources showed me the total absence of something like

StrCmp "$LOCALHOMEPAGE" "" FixPrefsJsClose
FileWrite $0 `user_pref("browser.startup.homepage", "file:///$EXEDIR/$LOCALHOMEPAGE")

as in FirefoxPortableU.nsi.

So, finally, why i am against Flash?
Flash's trusted-locations-policy makes it impossible to play MP3s from local locations like CDs without adding files to the clients PC (http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204...) or explicit user action (manually adding path to trusted locations).

Thanks in advance.