I understand about the general 'Preferences' settings, but in Adobe Acrobat 9 Pro Extended you could at least use the 'Typewriter' tool (which is now called 'Add Text' in XI) from the menu > 'Tools' > 'Typewriter' > 'Show Typewriter Toolbar' > and select a font, color, etc. > then once you use it, the font and color settings you've made stick and remain for future use, in essence as a default setting. With Adobe Acrobat Pro XI v 11.0.0 > 'Tools' button > 'Content Editing' tab > 'Add Text' option > the font defaults to "Minion Pro" (who uses that??), 12pt type, black. Even if you change it to your desired font format, it will change back in the same program session. on the next text edit. This software version seems too comprehensive and robust to not have such attributes available, so thought I'm just a dummy and couldn't locate the appropriate setting.
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