OpenRA

Sounds like yes, progress has slowed down, a lot.

Ideally spectators shouldn't cause lag.

Any updates?

Is it just me or has progress slowed down?

SHP is a multi-image format, PNG is single-image (AFAIK).

It depends, you have a number of choices.
1. Allow but don't require placement indication when a structure produce order is given.
2. Require placement indication. Changes gameplay a bit.
3. Require *and* start construction at the final location. Really changes gameplay, but might actually be quite ...

go to moddb, they have C&C for free download and it works with xp/7. otherwise the RA mod for this has only 1 build queue in the new 906 build.

I've got the original games...

and as for the buildings being placed instantly after build orders, that's not how all the building in C&C and RA games ...

the map sizes are already there,
It's in the details, not in the list.

the shading was a part of C&C and it's fine,

C&C didn't allow queueing...

the scrolling off the edge hasnt happened to me, and allowing buildings to be placed right after build order? that's how RA and C&C were designed ...

Game looks great already! Some feature request from me:
Add map size to map list.
RA2-style right-click drag scrolling
Don't shade build options when another structure/unit is being build.
Allow buildings to be placed right after build order. Being able to queue multiple buildings this way would be ...