You can easily locate and create a verification against the RadInput control during recording. Please see this video
for a demonstration.
Regarding your second question, currently it's not possible to debug and set breakpoints in coded steps in Test Studio Standalone. The key to debugging the code in your coded steps is to use Visual Studio's Test View
and run the test from there in debug mode. Any break points you set will now cause Visual Studio to stop on that break point letting you debug the source code as needed.
the Telerik team