I have flattery but the tab function doesn't work on 3D solids. I like to rough in my pieces and then add the tabs but flattery creates more work in the process and I can't specify lengths/squareness. It just takes the entire line segment and adds a tab. I need something to add like 5 tabs equal distance from each other and equal size along this parts edge. Also I need to intersect components not faces. Intersecting faces is a nightmare to clean up and not worth the time. I want to overlap two components and then intersect them without ever breaking the components up. Then I could make keys with the tab pattern in them and create the first piece then mate it to the second and intersect again. Slot 4 Tab would be really close to what I need but it's not working and the thread has not been updated since 2010.

Ok So my system is a bit better but still not performing good and I now have to restart every 30 mins or so instead of 10. I wiped all sketchup 8 and 13 files. Reinstalled 13. Then added the sketucation plugin mananger and like 3 or 4 plugins that I need. Simple stuff like center point, dxf export, and something else. Complexity of the file does have some bearing on it. A simple file just lasts longer before it starts to get jerky on the zoom and then slowly degrade to unusable. Doesn't matter if I'm using it or not. I can just leave it open and come back to have it almost locked up. The rest of my system doesn't have any problems. Just sketchup. I swapped the graphics card back to the better one and the issues is on both of them. Direct Diag doesn't show any issues. Everything is active and I don't have any problems with anything but sketchup. As for my memory, 500mb is labeled as free. I have 3gb and have maxed out my windows 7 32 bit system. Windows 7 will just eat all the memory that is left so I technically have like 2 gb free with windows eating it all for transitions and other crap that it will dynamically stop using as my programs need it. Driver is up to date. I've tried rolling it back and it doesn't change. SU 8 had the same issue. That is what prompted me to upgrade in the first place. So far, I'm not impressed with SU 2013. It's also the free version. I have not run a memory test but scheduled windows to do one the next time I reboot. Resetting the workspace from within the preferences menu fixes it once or twice but then it gets all weird and requires a full reboot. Other then a known issue with the video driver crashing during flash video, My system runs fine and doesn't have any heating problems any more. Games run fine for hours. The only program that is screwy is sketchup. Could it be the sketucation plugin? I didn't have problems before that was installed. It's the only thing I can think that changed around the time that the problem started and it has been in every instance that I have tried. It was stable for a bit without any plugins but I can't do actual work without my dxf exporter so I generally only tested it for a bit then installed sketucation and the dxf exporter. I might try a fresh install without that plugin.

You can use Selection Toys to select faces of the same orientation. I use that often for such task you describe.