The "Combos Used" window (accessible via Tools->List Combos Used) would be easier to read if the text box used monospaced font. The column of parenthesized numbers especially doesn't line up correctly.
Monospaced font in Combos Used window
This window is created by onUsedCombos() in zquest.cpp
This line of code seems to apply only to the title bar:
usedcombo_list_dlg[0].dp2=get_zc_font(font_lfont);