I agree. Also it should be allowed for players trying to lease used aircraft to lease a whole batch at a go. I've once found over 25 0-year-old Airbus A320-200 aircraft that I wanted to lease but could only negotiate for them one at a time. By the time I had finished, I had wasted over ten minutes of my precious time AND lost some aircraft to other competing buyers. Even if it is not allowed to lease two variants at a time, batch leases should at least be allowed on the used aircraft market, I think. The buy new aircraft section has this feature, so why not the used aircraft market too?
Because spamlines would be able to lease the whole aircraft market which will give new/small airlines almost no chance to grow.