When pasting the link, add "&t=XmXXs", and replace the Xs with numbers. In this case, "&t=2m29s"
That's the only thing added to the link, so as long as you know how many minutes and seconds into the video you want to share, you can type it in manually.
Not the same as having a dedicated button for specific times, but it's a simple workaround.
In Battlestar Galactica? IIRC that's a nickname, not her actual character's name. I've not seen Riddick, but Dahl is an actual character's given name in another series I've read, and there it's a male name, so after reading the OP but before watching the video I assumed it was a male there too.