upnp: OnlyPermanentLeasesSupported ?

Folks,

It seems that RouterOS v6 only supports upnp permament port mappings, and thus commands such as:
$ upnpc -e UPNP-mapping-comment -a [LOCALIP] 5000 5000 TCP 400

will fail with:
[…]
Found valid IGD : http://[ROUTERIP]:2828/upnp/control/tlmlqkusmb/wanipconn-1
Local LAN ip address : [LOCALIP]
ExternalIPAddress = [EXTERNALIP]
AddPortMapping(5000, 5000, [LOCALIP]) failed with code 725 (OnlyPermanentLeasesSupported)

Are there any plans to support timeouts for UPnP port mappings?

Thanks,
Fernando