Just FYI -
1)Bike Pittsburgh and/or their staff have joined forces with a statewide group that will be working towards bicycle AND pedestrian advocacy. That's the extent of what I know...maybe someone else can provide more details.
2) The three Transportation Management Associations in the region (Oakland, Airport Corridor and Downtown) will be kicking off a "Walk Pittsburgh" campaign in the coming weeks. They are already stepping up to the plate on issues of pedestrian advocacy. I am certain they would welcome your participation.
3) Most pedestrian "support" responsibilities occur at the local level. That includes sidewalk maintenance; crosswalk identification/request for assessment; crosswalk painting/maintenance; and pedestrian signals. The most effective advocacy will focus on the very local level.
4) The City of Pittsburgh has a (relatively new) position of ADA Compliance Monitor (or something similar); he might be a valuable ally.
5) SPC would welcome pedestrian interests at the quarterly pedestrian-bicycle advisory committee meetings. Next meeting is August 11th. PM me if interested in learning more.
6) Let me know if you get anything going; I might be able to provide a little in the way of institutional support.
7) PennDOT (District 11) has completed a handful of pedestrian compliance reviews at locations around Pittsburgh over the past year or so. In partnership with local law enforecement they do a targeted review of motorist compliance for a few hours at a pre-identified location. They did one on Liberty Avenue, downtown, and another in Oakland, that I can remember. Maybe we can ask them to do a couple more?