Envision Downtown has a new project regarding possible changes to Liberty Ave in downtown:
http://www.envisiondowntown.com/lifeonliberty/
You might recall this from that news item on KDKA last week (?) where the Army surplus store owner complained about this, while some of the eateries on Liberty were asking for a wider sidewalk. In any case, Envision D has a survey on the project page, as well as office hours when people can stop by and provide their input.
Personally, I'd like to see Liberty Ave become a more efficient transit corridor, with at least one dedicated bus lane. This would be easier to accomplish on the eastbound lanes than the westbound ones, since only three of the routes that go east on Liberty have to turn left to go north towards Penn and beyond (29, 31, and G31, with only the 31 running Mon-Sun). By comparison, the number and frequency of routes turning left while on westbound Liberty is considerably higher, so it'd be trickier to have a bus lane there. There's also less on-street parking spots on the eastbound side
Wider sidewalks could be nice on the north side of the road, but not really required on the south side. Don't really think there need to be bike lanes on Liberty
Be sure to take the survey and add your input!