Gotcha... you're pretty much SOL. The width of the field is based on the length of the field names in default.cfg. However, if you don't use auto-generate and then you can add your own descriptions that are shorter.
example:
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<SELECT NAME="sb">
<OPTION>---
<OPTION VALUE="0">ID</OPTION>
<OPTION VALUE="1">Title</OPTION>
<OPTION VALUE="2">URL</OPTION>
<OPTION VALUE="3">Type</OPTION>
<OPTION VALUE="4">Date</OPTION>
<OPTION VALUE="5">Cat.</OPTION>
<OPTION VALUE="6">Desc.</OPTION>
<OPTION VALUE="7">Valid</OPTION>
<OPTION VALUE="8">Pop.</OPTION>
</SELECT>
Notice how the "value" corresponds to the field number in default.cfg and the description or label can be anything you want.
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If you absolutely gotta use auto-generate and have shorter names then look at this post which you could hack to use for "short names".
http://www.gossamer-threads.com/...rum.cgi?post=276527; .