I tried thinking of something to request because there’s not many things of use out there nowadays.
So with this ‘Wall Maker’ you can make simple buildings, or maybe a fort.
Think of SCars’ spawner, where you can select cars and such and click on the floor to spawn it.
Well, similar to that, only you change it with props. Above the icons will be a pull-down menu with a blank spot for default selection. The options will be; Phoenix-Storms (certain selected PHX props would be selected for walls), Half-Life 2 (again, certain props), Counter-Strike (certain CSS props, probably), and all that.
The reason I included “Phoenix-3” in there is because probably 95% of GMod uses it, or at least as far as I’ve seen, most/all people who have joined the Gluttony server has had PHX3.
So you choose a tab, and icons will show up. If you scroll down on this wall-spawning section thing, a radar-like thing will show up. It should outline things that are there, and you can select wall pieces and make a pre-set wall set, so when you press mouse-1, it spawns this wall preset.
I can’t quite describe it. If you’ve played, for example, Hornby Virtual Railway, you can select track pieces and they’ll automatically connect to each track piece and such.
When in the Wall-Maker mode, you can select or de-select an option for “Add fence?” which can add a fence on top if you plan on getting on top of the walls.
When you’re finished with the wall making, find a spot to put it as it shall be ghosted, and press “Mouse 1”. It should detect things like walls (brushes, props, etc) so you don’t screw something up, and so people cannot block roads and stuff in maps. 
You can also connect the wall pieces in the Wall-Editor to any of your props. So if I want to attach a wall section to a container, then I’ll hold mouse 1 over, for example, a small piece of wall, and it should stick to one end of the prop. Depending on where it sticks it will stick in that prop’s direction. (Shipment container, if you stick it on the square ends it will stick in the long-direction, but if you stick it on the rectangular side of the container, then it will stick in the 90 degrees way).
My hopefully understandable pictures:
http://img412.imageshack.us/img412/6918/wallmaker3d.jpg
http://img11.imageshack.us/img11/5725/wallmaker2d.jpg
http://img42.imageshack.us/img42/916/wallmaker2.jpg
I tried getting the pictures to be as understandable as they could. Sorry if it isn’t that understandable.
One valid reason for this is that it -SHOULDN’T- be an option for advanced dupelicator, because you may see shitty versions of these.
Another one would be that most can’t quite make their fort walls, and make them out of containers almost all the damn time. This should perma-weld, and freeze the props. You can undo the weld by pressing the reload button on the prop you wish to unweld, and you can do the same with the remover tool.
No, I will not use stacker. Derp.
nudge