Centralised discussion space for TfL plans and cycling in London

Odessa Road is already a rat run, wouldn't making it a boundary exacerbate the problem?

Not necessarily. Rat-runs often function in conjunction with other side streets, i.e. someone may use Odessa Road as part of their rat-run and other streets as other parts. If the latter became unavailable, the usefulness of Odessa Road as a rat-run could also decrease. As I said, I don't know that area very well, so it's up to local knowledge to reach a verdict on that. The existing one-ways certainly suggest that more than just OR was in the past being used to rat-run before the one-ways came in (although they probably also reflect past/present rat-running parallel to Cann Hall Road).

I'll look into using this example in the feedback reviews

For this particular project, it's not necessarily the most appropriate, as it's a major one-way system on what became the Inner Ring Road in 2002/3. You're looking at a residential area. Also, as I said, Shoreditch is still not completely two-way and numerous problems remain. There are plenty of existing filtered areas, though, like De Beauvoir, and good and bad examples of filtering everywhere. If you want a bad example, try using Lower Clapton north of Powerscroft Road (between Lea Bridge Road, Lower Clapton Road, Powerscroft Road, and Chatsworth Road)--all the filters are at the northern, eastern, and southern edges of the cell. For a good example, use De Beauvoir with the exception of the filters at the edges, e.g. the one at the Southgate Road/Northchurch Road junction is very bad. (It's part of the reason why that junction is so hazardous.)