The hack that was referred to is not that difficult, but I have seen it running on boards that still have sig length issues. For example, people would post an image AND text. And when text was a larger point size than standard, it is not considered in this hack, so there were still very large sigs.
What would be difficult is to write a truly comprehensive hack that covers all the possibilities. The only other option is to just limit the possibilities in sigs. But if you allow images AND text and text markup, then you need a hack more complex than this one.
Admitedly this hack is better than anything that currently exsits, but I dont think it is enough. I have over 27,000 members on my site and we have to manually enforce the sig length rules. I have implemented a number of sig limit hacks and members have found ways around them within days.
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