When I tried a G25 few month ago I decided that somehow I will get a clutch pedal (I have DFP). I had no money so buying anything was out of question. I used my old gameport joystick's electronics and one potentiometer and built the pedal from Technic Lego . Lego can be surprisingly strong and the pedal I made works flawlessly in LFS.
When I first played LFS (around 2002) and screwed T1 I was very happy because I like simulators. If a newbie realises that it's not NFS he has two options, he tries to be more careful until he can go around the track and eventually he can race online or he can just give it up. It's a little harder to drive without throttle blip but I don't really see why is that a problem when everybody have to drive without it. Everybody will be slower a little except those who are willing to blip (if you can't simply be more careful with downshifts). Maybe we need more warnings or more training for newbies but I think LFS going in the right direction. For example some new players tend to choose GTT when they first start LFS because they think they can handle it because in XY game they were pros. There should be a little message(only at first start) that this is a powerful RWD road car if you experience difficulties choose one of the lower powered cars or click Training in main menu.
Edit: Most newbies are using automatic transmission so they don't really have to worry about these things and I think blipping is pretty easy with keyboard + mouse combo.
They get more than a normal demo user who is not using crack but they won't experience the best part of LFS (online racing, LFSW stats, etc..) until they pay for it.
It seems that they can't go a lot faster than that but in the next incompatible patch we'll get better AI and some other things so I think it's worth the wait.
G25's pedals require more strength to operate than any previous Logitech pedals and people can use older Logitech models without any problems so I don't think it's very hard to control the throttle with a G25. I don't know if you have ever driven a real car but you may be surprised how soft the throttle can be on some cars.