As you get better in tactics, you should be able to see some more easily and quickly. For instance, if you reach 1800 level on TT, you shouldn't struggle to find a free piece, fork, etc. However, I do agree that there shouldn't be negatives if you do eventually see it but dont do it in the "correct" amount of time. I'd personally make it +0 or +1 in that case.
Tactics Trainer Point System
Losing points for a correct answer is a very common complaint. Staff promised that one of the changes coming to V3 of the site will be a major change to the TT. You will never again lose points for a correct answer. You may not gain any points, but no more minus scores. Will this make the final cut? We're due to find out in a few days...
Been trying out the tactics trainer on this site, and Ive noticed that you are penalized a lot even if you get it right, but take like over a minute. Is there any particular reason for this? I can understand getting +1 instead of something like +15, but is there really a reason for me to go -19 for not solving it in 5 seconds?
If you do not know the answer to this question, please share your opinion on the matter as well. I, for one, think that any system that penalizes a correct answer is a little weird.