Yes and no.
In essence I must place icon in a folder already "monitored" by theme server (in order to accounts and share apps "see" it) so MTheme::addPixmapDirectory maybe wouldn't work. Even if it works only place to call it would be when already creating account ("Red square" is already visible when you scroll to it when searching in a list of accounts to create) - I could try to make small executable and try to call it during installation - but all in all it seems like a lot of trouble and with unceratin results.

It's a known glitch (for example mentioned here: http://wiki.maemo.org/Wazapp#Red_Dot...fication_Icons) and solution is just one simple reboot away