You would have to modify the template to do that. (probably both forumhome_forumbit_level1_post and forumhome_forumbit_level2_post) Find:
HTML Code:
<td class="alt2"><img src="$stylevar[imgdir_statusicon]/$forum[imageprefix]forum_$forum[statusicon].gif" alt="" border="0" id="forum_statusicon_$forum[forumid]" /></td>
Replace with something like:
HTML Code:
<td class="alt2">$forum[statusicon]</td>
You may want to write a plugin to modify the statusicon 'text' or just write a condition in the template to do it. ie:
HTML Code:
<td class="alt2"><if condition="$forum[statusicon] == 'old'">OLD<else /><if condition="$forum[statusicon] == 'new'">NEW<else />WHATEVER</if></if></td>