REMINDER: BACK UP ALL FILES BEFORE YOU TOUCH THEM.
1) Unlock the maximum string length:
within ...Games\DCS A-10C\Scripts\UI\CommandMenu.lua, search for and change local menuItemMaxLength from 26 to 100; this is the cutoff length where it uses (...)
2) Change the radio dialog size
within ...Games\DCS A-10C\FUI\Resources\Radio\menu.res, make the two changes highlighted in red (reduce existing number by 300, this will extend the dialog left by 300 pixels).