While I haven't used this software, I do have 2 programs that I have found useful in the past, and will probably find useful as I get, eventually, to the scenery part of the layout. They are both from Evans Designs. One is called Trans Station. The program lets you do 3 things. Road signs: There are a LOT of signs here you can just print out, but there also is a sign designer, so you can design your own road signs, plus you can even import a graphic to use. Second is Billboard advertizements: Here you have maybe 20 total designs, but as before, you can also import a graphic, like the ones over on trainboard.com. They are located in the "Inspection Pit" section of there. Tomkat, the OP, has added many hundred more since the last time I was on there. He does have some on here. The Third section deals with Brick/Stone "backgrounds", and the placement of window frames in them.
The second program is called the "Modelers' Toolkit". Here There are 4 sections. One is a section for "dressing" windows with things like curtains, shades blinds, and silhouettes of people, lamps, pets, and other graphics. Again you can import a graphic to "go" behind the shades, etc. They also have templates for companies like Life-like, Walthers, City Classics, DPM, and several others. You can even design your own. The second section, is another sign creator like the one in Trans Station, but is more robust. The design your own section is more robust. Again, you can also import different graphics as well. The third section is American Advertising. This is another Billboard section, or design your own. This also has a graphic import function so any signs saved on your computer, like from the aforementioned "signs for your layout" courtesy of Tomkat again, can be used, and you can make them any size needed, change colors, etc. There is also a Burma Shave sign section. The last section is stained glass. There are some designs already drawn out that you can use, as well as a designer section, to do your own.
These two programs have allowed me to add these things to just about any structure I want to add this kind of detail to, or using the brick/stone window frame, you can design your own structure with it, and print it out using cardstock, or even thin styrene. Then you cut out the building and assemble it. The only thing I don't like about either of these programs, is no roofs are in them.