Series linking programmes which have already started


There's been a few times where a programme has started and I've decided I'd like to be able to series link that programme. I'm aware the Humax EPG, for some odd reason, won't let us series link a currently showing broadcast but I thought the custom webif EPG would allow us to override this restriction.

Unfortunately, it doesn't. If you attempt to series link, you get "Error, cannot record programme which has already started showing or occurred in the past." Why does this limitation exist, it doesn't make sense to me?
I have done this in the past by doing a series link on the next episode, wait until that records, then move the first episode into the folder.
If RS Auto / EPG Keywords had a 'Series CRID' search field it would be possible to display the details of a currently showing program and use the 'Series CRID' details e.g. Series CRID = FP.BBC.CO.UK/L3476C to add an automatic recording of any future programs in the same series