BTW, what a tweak or two you thinking about?
Take note that if for example this is the tweaks to appearance, it's possible to do without touching the sources,
through Chrome feature - using the User StyleSheets\Custom.css file,
this way actually anything can be changed that is set through css
Other possibilities exist.
Also i plan in some future version introduce possibilities to inject code inside TO through plugins (extensions for extension : )
And from them there will be access to the whole DOM tree and TO internals.
For example to add some custom panel, with anki lists for example - will be actually very useful.
It will be interesting to know about what tweaks people thinking about.
Best Regards,
Vladyslav