You could use the multi-select checkbox and only provide one option. If the checkbox is selected, it is a bitwise field, so it will be set to 1 in this case. Otherwise it will be blank, so you could simply rewrite that condition to:
HTML Code:
<if condition="$bbuserinfo[field5]">...TOP10 STUFF HERE...</if>
I think I misled you slightly. It should be $bbuserinfo[field5] not $userinfo[field5]. Woops. But you get the idea.