Both companies are very small. I don't think that they are one-man shops but they could easily be nowadays. I use a few Melda plug-ins and have no troubles but I'm on a Mac and cannot run Mixcraft.
I honestly don't know what Signature means in this context. Perhaps a short explanation or sample would help?
Because you're asking about Mixcraft, I already know that you are running Windows — other than that, I know nothing about your setup.
If you look at Matt's and my posts, you will see that we give basic information about our BIAB version, OS, hardware, preferred DAW and anything else that we think anyone answering a question might need to know. This is our Signature and we Create/Edit in our user profile so that it appends automatically to every post we put up.
To get there, click onto your name at the left of your post and select the "Edit Profile" link. A new screen will appear. Now click onto your name in the upper-right and a drop-down menu will appear. Now, click on Edit Profile and you should see how to do it. if you want to add color or certain links, click onto UBBCode and you'll find instructions for html that you can enter.