Odd.... how do you guys install the file ?
I did it under root with dpkg -i libevent-1.4-2_1.4.13-stable-1_armel.deb and this works. Never installed a deb in a other way

btw. I think it will take a little bit longer to get it to the repos. It takes more than transmission to be compiled.... (libevent-1.4-2) Funny thing is that libevent-1.4-2 is already build in armel, but not in the maemo repos.
So here is the deb : Transmission

libevent-1.4-2 is still needed to be installed to get Transmission to work.
Will hopefully solve this problem soon.