A while back I installed the free trial or demo (I forget which it is) of Fruity Loops, or FL Studio, to see if I could help someone who was having a problem doing something in it. I don't remember what they were trying to do, but as I recall it was something that I considered to be a fairly basic operation for a DAW, such as use an external MIDI keyboard to play a virtual instrument using FL Studio as the MIDI router and VI host, or something like that. Whatever it was, it wasn't merely a question of recording audio or MIDI tracks, but it was still something that I regularly use DAWs for.
In any case, for the life of me I couldn't figure out how to do it in FL Studio. It may have just been me, because many DAWs have their own unique style of user interface, and FL Studio is certainly no exception-- and it wouldn't be the first DAW that stymied me because it did things differently than what I was used to.
But if you're thinking about FL Studio, you might want to try the free demo or free trial version before you outright purchase it, just to be sure it will be able to do what you're wanting to do, and that you can figure out how to use it without too much angst on your part. Of course, that also goes for any other DAW you're thinking of purchasing.
As far as having to sign up or register or whatever, it may seem strange and intrusive to have to register to use some software that's supposed to be free, but even though it's free the companies that do this still require that you have a registered license to use their free software. You don't have to pay for anything, but you do need to agree to their licensing agreement.