Don't be frightened to do it yourself (I bet you will be anyway)!
There are 2 options:
1) Setup a development environment and edit source mlv_rec.c according to your needs. Then build your own ML. You will find the instructions and scripts written by dfort and others easy to follow.
Change case 3:
start_delay = 10; break;
default:
start_delay= 0; break;
to
case 3:
start_delay = 10; break;
case 4:
start_delay = 37; break
default:
start_delay= 0; break;
37 is just an example, do as you like.
2. Load lua.mo, restart and start "Movie Delayed Start" from Scripts tab.
Then switch to Movie tab where you will find an entry "Delayed start" with "Delay Amount" from 0s to 10 min. Don't forget to check "Stop after"!
PS: Next time asking for a feature you should first check if there is a script for it. If there is you have to explain why it doesn't fit your needs.
Don't forget to mention the build you want to be changed.
Don't forget to mention the tab, module (if any), menu item, submenu item you want to have changed. There is a ton of menu items around and sometimes they sound pretty similiar and we may have no idea what you are talking about.