No. Roofing nails have too big of a head for the palm nailer. There are models available specifically for Roofing nails.
I would not recommend using the smaller finish nails with this tool it is generally meant for nailing in tight spots with large nails. I use mine for nailing on joist hangers and other structural hardware
HDX nailers are only available online.
I don't understand what is meant by "nail on the angle" but I used mine to punch in joist hanger brackets, which orients the nails some at 90-Deg to the board and some at 45-Deg to the board.
You should be able to use it on most any nail as long as nail head will fit in opening and it is not too tight of space. I have really liked using this tool. Works great and price is good also. Highly recommend and had several friends who liked it as well.
It could be that the bolts are loose, I would return it
2x4 is what I performed my test nailing with this tool. I was impressed on how it drove the nails
Not having used the larger nailer, I can only think the larger 'might' be built to be a longer lasting tool. I use the small nailer only for tight places and have no trouble with it. Some Brands cost more, this one did the job for me. I consider it a throw away tool with it's low price, it was fine for what I use it for. (2x4) etc. Use Oil as Directed, IMPORTANT. Use proper air supply also and stand back, it will surprise you.
Technically, yes, but it might be easier to just use a regular hammer.
This nailer should be available soon, in the meantime here are a couple very similar items: Freeman: https://www.homedepot.com/p/Freeman-Pneumatic-Mini-Palm-Nailer-with-Cushion-Hand-Grip-and-Magnetic-Tip-PMPN/202511009 Husky: https://www.homedepot.com/p/Husky-Mini-Palm-Nailer-HDPMPN/203362177 And this one that has a depth adjustment by Estwing: https://www.homedepot.com/p/Estwing-Pneumatic-6-degrees-16-degrees-Mini-Palm-Nailer-EMPN/300115373?keyword=Estwing+palm+nailer