If you know what the filters will be you can use the select widget to set a
field to the entire filter string and use a text reference for the filters.
<$select field='filter_field'>
<option value='[!is[tag]!is[system]]'>Some name</option>
<option value='[!is[tag]!is[system]]'>Another name</option>
</$select>
</$select>
<$list filter={{!!filter_field}}>
</$list>
Where you add an option to the select widget for each filter string.
If you need more flexibility you could have a sequence of selections that
build a string for the filter operators. Like the examples here, but each
selection would set a filter operator instead of part of a url
http://inmysocks.tiddlyspot.com/#Concatenating%20text%20to%20make%20dynamic%20URLs
Does that help?
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