I asked for this a couple weeks back. I never got a response, but I found a solution on my own.
Quick and Dirty Instructions:
Open the resources0.s2z in your HoN folder with 7-zip or similar program. extract the core_en.resources file (or es, fr, etc. depending on your language) and open it with a text editor. Basically, this file contains all the font size settings for the game. Change the "size" values to whatever you think might be comfortable. Save the file and replace the one inside resources0.s2z with your custom one. Be warned though, the rest of the UI does NOT scale, so sometimes the text runs over (its fairly rare, though). I found that bumping everything up by two points makes a good difference, but YMMV.
Here's just a portion of what my edited core_en.resources looks like:
Code:
<fontface file="/core/fonts/game.ttf">
<fontmap name="dyn_6" size="10" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_7" size="10" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_8" size="10" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_9" size="11" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_10" size="12" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_11" size="13" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_12" size="14" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_14" size="16" dynamic_fontsize="true" baseresolution="768" axis="y" />
<fontmap name="dyn_16" size="18" dynamic_fontsize="true" baseresolution="768" axis="y" />
</fontface>
Enjoy!