The item tooltip that is to wide can be adjusted safely to 220 without major clipping issues as seen below:

There are 3 instances of this in tooltip.cpp you must change all 3, the one in BLUE is the number you change.
Code:
#if __VER >= 18
m_strToolTip.Init( CWndBase::m_Theme.m_pFontText, &CRect( 0, 0, 220, 0 ) );
#else
m_strToolTip.Init( CWndBase::m_Theme.m_pFontText, &CRect( 0, 0, 200, 0 ) );
#endif
I will update the source to reflect this sometime next week but you can go ahead and do it now if you want.