Sounds like its working the way the old UIs mod used to way back in the 3.4.something days. If this has been altered then by all means disregard my post, but here's how that feature works:
In silent hunter 5 the submarine crew will not proceed to crash dive as long as you (the captain) are outside the ship. To get around this, the UIs feature teleports you to the radioroom automatically. After this has taken place, a timer (which you can set) starts ticking off the seconds before the actual crash dive begins. So, while this can be annoying sometimes (like being teleported off your periscope), for the other 90% of the time you're going to be conducting emergency dives, you're going to be grateful that it teleports you automatically, instead of jamming the hotkeys and screaming at your XO like I did the first few times.
Now, I noticed you're using stormy's sound mod and church's key commands. Good stuff on that mod list btw
There is a bug with these two mods. Stormy's mod (or maybe its another) screws with the crash dive feature. To fix it, follow sto's advice and go in and adjust Darkwraith's UI, change it to "C" like he said. That should fix it. Second thing is to change the timing on the dive, which you'll also find in the same section. Kylania made a nice video showing how to modify the options file, you can find it on youtube here:
If you're having trouble accessing the file you can download of demo of python here:
http://www.python.org/ , which will allow you to open it up and modify the file.
This video is months old so you'll have to just watch it as an example and not take it verbatum. Hope this helps!