vox, I would have liked such support as well. This firmware does not have No-IP included though, no. DynDns.org is free as well, so you may consider switching. If not, you could try and get it in custom firmware...
So far for me, and I'll regret saying this if the problem shows up again, 1.9.2.8 beta has seemed to fix a problem I've had involving random WPA-PSK drops, but check the thread if you want to see the status of that and I forget to update it here. I would attempt to delve once more into the programming realm after a bit of an absence from it to try to implement No-IP support from some sources of some of No-IP's updating software, but if I were to do so I'd probably wait until 1.9.2.8 was officially out along with its source.