way to add code before \documentclass{}

[Bogdan]

Is there *any* way to make LyX add latex code before the 
\documentclass{} call?

For the IEEEtran class for instance, the page margins can be set only by 
setting some IEEEtran latex variables before the \documentclass{} call 
... the use of geometry package or the likes is highly discouraged for 
IEEEtran.

Could I define a new layout, inheriting from the IEEEtran one and have 
my latex code appear there maybe?

Thanks in advance (and Happy new year by the way),
Bogdan

p.s. If not, I think this is a worthy enhancement to have in LyX. Opinions?