mscore/file.cpp: Potential Changes/Improvements

I'm in the process of separating my SVG animation export code from the basic MuseScore SVG export code. To do this I'm making some changes in file.cpp, and I'd like to see if anyone foresees any issues with these changes. I'm not suggesting integrating this with MuseScore at this time, but this is a first step in that possible direction:

1) Adding two new file types to the standard file dialog filter, both of have the .vtt file extension, and both of which export a combination of SVG and VTT files. I'm using Windows 7, and don't have access to test on other OSes at the moment. Here is the code I'm adding, with a little context, to exportFile():
fl.append(tr("Uncompressed MuseScore File (*.mscx)"));
// two new types
fl.append(tr("SMAWS SVG+VTT (*.vtt"));
fl.append(tr("SMAWS Rulers (*_rul.vtt"));
This should work everywhere, as it is the same as the lines of code above. The only oddity is the pseudo file extension "_rul.vtt".

2) Class MuseScoreCore's first member variable is Score* cs; , yet in file.cpp all the MuseScore::saveXXX() methods pass around a Score* variable as an argument. This is made more confusing by the fact that this argument is sometimes named "cs" just like the member variable, and sometimes not. In changing exportFile(), I must also change saveAs(), the one with 4 args. To cut to the chase, here is what I want to do:
a) Remove all the Score* arguments in all these saveXXX() functions and use the "cs" member variable instead. It is the "current score", just like the arg being passed around.
b) Replace the "name" and "ext" args in saveAs() with a single QFileInfo* arg. So instead of:
bool MuseScore::saveAs(Score* cs, bool saveCopy, const QString& path, const QString& ext)
it would be:
bool MuseScore::saveAs(bool saveCopy, const QFileInfo* fi)
Both a) and b) require changes to musescore.h too. For b), all of the 3 functions that call saveAs() have a QFileInfo fully populated and ready to go, and this simplifies/consolidates bits of code inside saveAs(), as well as providing me all the info I need to deal with my "_rul" pseudo-file-extension.

Foresee any issues? Is 2) something that seems positive and integratable into MuseScore sooner rather than later?