Divide checkbox list into 2 columns?

[ZiNgA BuRgA]

Unfortunately, you're going to need template edits for that.  Set Hide Input Field to yes and construct the appropriate table rows into your newthread and editpost_first templates. (prefix appropriately if you're using a template prefix)
Very vague HTML structure:

HTML Code

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

<tr> <td><strong>My Checkbox Field</strong></td> <td> <table> <tr> <td><label><input type="checkbox" name="xthreads_my_checkbox_field1" value="1" /> Checkbox 1</label></td> <td><label><input type="checkbox" name="xthreads_my_checkbox_field2" value="1" /> Checkbox 2</label></td> </tr> <tr> <td><label><input type="checkbox" name="xthreads_my_checkbox_field3" value="1" /> Checkbox 3</label></td> <td><label><input type="checkbox" name="xthreads_my_checkbox_field4" value="1" /> Checkbox 4</label></td> </tr> </table> </td> </tr>

---

The HTML in the values list is probably a bit different to what you want.  It allows you to have something like:

Code:

Item 1 Item 2 <i>(rare item)</i>

---

...and thus not meant to change structure.

Hope that helps.