Sure,
for now I just disabled it,
so that's not really "pullrequestable" !  ;)

If you are a coder, you can simply do it your self and send a pullrequest to github.com/bitshares/bitshares_toolkit

besides that: thanks for the report

Under Unity,
The tray icon is not displayed in the systray.

Please use this solution (or disable tray icon under unity)
http://stackoverflow.com/questions/17193307/qt-systray-icon-appears-next-to-launcher-on-ubuntu-instead-of-on-the-panel

in bitsharesx/programs/qt_wallet/MainWindow.cpp
MainWindow::setupTrayIcon()