It'd be nice to have an ability to step into a specific function during debugging.

Imagine that we have the following code:

foo(bar(), baz(42));

and we want to step into foo. In this case we have to perform "step into"/"step out" a few times, which is not convenient. 

It's possible to use Microsoft Visual Studio approach: when debugger is on a certain line there are all functions to step into listed in the right-click menu. For the example above "foo", "bar", and "baz" should be listed.

Technically, this is possible at least for gdb/lldb. See the documentation for the following commands: advance, until, and skip.