what you want ...is your cake...to eat it too...and refund it as well for the value of 3 cakes...

When utilizing any usb ...as in "mass storage mode" or "pc suite mode" or "usb charging mode"
it doesn't matter if the device is a n900 or any other random device that can do the same thing.

For example....
the nexus 5 and say...
maru os..or...buntu convergence..
with a monitor and bluetooth mouse and keyboard...
utilizing a "slimport" cable that allows connection to the monitor and device...as well as power to the device...
Even STILL...
with power being fed to the battery ...
It is not even a "holding pattern" on battery ...
there is a power drain on the battery...
and that is a very well thought out implementation and usage...

Expecting miracles out of one micro port to be able to handle work loads of data ...connected devices...and keep the battery up...
Is expecting a lot.

That is one of the reasons why I so love the separate power ports on the n8x0s
It allows for heavy work like you are wishing for.

(And by the way ...flying close enough to the sun with feathers and wax ...well...for the wax to get warm enough to melt...you also would most likely have zero oxygen to breathe...and the feathers would most likely catch fire ...turning you into a nice wax candle ...first...
Ever before the wax just melted...
Not really a pleasant way to go...
1- a frozen popsicle before you get there...
or
2- a flaming mass of wax and feathers...when you do get close enough...
either way Daedalus would be laughing ..)