The login routine hands off the start page via the function "start_page" in the libs/html.inc.php file. This is completely untested, but I believe you'll want to adjust:
if ($start_view == "lists") {
$main = "myhome&type=lists";
} else {
$main = "cfrm";
}
The only "start view" options currently in UBB.threads is the forum summary (cfrm/Traditional Forum View) or "Follow Lists" (lists); these can be selected via "Edit Preferences", whereby their value is processed in the start_page function above.
I believe you could just build an additional elseif to inject additional pages into the start_page function, such as:
if ($start_view == "lists") {
$main = "myhome&type=lists";
} elseif ($start_view == "faq") {
$main = "faq";
} else {
$main = "cfrm";
}
And you'd also have to edit the display preferences template (templates/default/editdisplay.tpl) and language file (languages/english/editdisplay.php) to add any additional pages.
{* Starting View: Watchlist or Forums *}
<label for="start_view">{$lang.DEFAULT_START}</label>
<br>
<select name="start_view" class="form-select" id="start_view">
<option value="lists" {$list_selected}>{$lang.FAV_LIST}</option>
<option value="cfrm" {$cfrm_selected}>{$lang.FAV_CFRM}</option>
</select>
<br><br>
It'll take some playing around (you'll need to add additional selected lines in the editdisplay script to handle logic that doesn't currently exist, as an example) but its entirely possible with time and testing.
We've discussed adding to this feature in future builds of UBB.threads, but currently don't have any concrete timeframes at hand.