I am making it required when a guest submits a listing they must check a box saying they understand they can not edit a listing after they submit unless they register.
I however do not want to make the admin or registered users have to check the box on every listing because its rather redundant since they are already are members.
Step 1: Create a listing field, which I called iknow as a checkbox value yes, which came out to be {LINKIKNOW}
Step 2: In your suggest listing template add something like this.
<IF {MEMBERUSERGROUP} is 1>
<span class="labels">Not being a member I will not be able to edit or subscribe to my submitted listing, however I can <a href="http://www.yourdomain.com/register.php">register</a>.
<input type="checkbox" name="iknow" value="yes"> Understood
<ELSE>
<input type="hidden" name="iknow" value="yes">
</IF>
Step 3: Now you will have to change your edit listing template as well which I added:
<input type="hidden" name="iknow" value="yes">
If you do not add the above its going to tell you, you have not completed all of the fields because its looking for a check box input.
Step 4: Now go into your settings area in your admin and add the iknow as a required field.
By making it obvious when they submit a listing it might help them understand the benefits of registering.