OK. my bad, I did say I had some serious PEBKAC going on.
Found this thread: viewtopic.php?f=3&t=2082&p=9547&hilit=change+font#p9546
As for question 2, that is still open and of interest to me, the v1.4 default tab font is a lot more legible than the v2.0 tab font on my XP system, so being able to define it would be neat.
Additionally can the close "X" be suppressed with an option, as well as the suppressing the display of the extension? - I would like to trim as much wasted space (from my perspective) from the tabs, as I only cut prose and not code these days, and swap from netbook screen to external monitor. As far as I can tell with v1.4 for instance, rightmost tabs just truncated on a small screen and cannot be accessed.
PS: Just a vague reminiscence from my creaky, ancient, mostly forgotten, X-Windows days, but being able to theme all the GUI elements to say (Monokai) including the main pull down top menu would be way, way,cool, aesthetically text and editor being at one, zen elegance.
And in terms of total font and menu and GUI element proportioning and proportionate "plasticisation" it could lead to an "no fixed font surprises" editing system that would a joy to use for sight challenged users as well. Perhaps in the V3.x branch!