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For anyone wanting to achieve this themselves, it's very easy.

Template: watch_threads_all

Find: [html]<form action[/html]

Above add:

[HTML]

<style>

    .pageNavLinkGroup .CheckAll

    {

        padding: 0;

        margin: 0;

        vertical-align: bottom;

        position: relative;

        top: -1px;

        overflow: hidden;

    }

</style>

<div class="pageNavLinkGroup">

    <div class="linkGroup">

        <xen:if is="{$threads}">

            <a>

                <label>

                    <input type="checkbox" checked="checked" class="CheckAll" data-target=".discussionList" />

                    <span>{xen:phrase select_all}</span>

                </label>

            </a>

        </xen:if>

    </div>

</div>[/HTML]

Note: I do not recommend that you include styling in <style> tags, I just have above as a demonstration.

The end result:

[ATTACH=full]66154[/ATTACH]