How to schedule screen recording with screen recorder that doesn't support scheduling

You may try to create a macros with automation software like freeware macromaker.

Sample macro for Replay Video Capture

  <?xml version="1.0" encoding="ISO-8859-1" ?> 
- <MACROMAKER ID="1003">
- <MACROS>
- <MACRO Name="record with RVC">
  <repeat>1</repeat> 
  <id>6</id> 
- <COMMANDS>
- <INS0>
  <id>4106</id> 
  <Arguments>http://www.youtube.com/appliantechnologies</Arguments> 
  <DirName /> 
  <FileName>C:\Program Files\Internet Explorer\IEXPLORE.EXE</FileName> 
  <WindowName /> 
  <RunIfOpen>1</RunIfOpen> 
  <ShowStyle>3</ShowStyle> 
  </INS0>
- <INS1>
  <id>4106</id> 
  <Arguments /> 
  <DirName /> 
  <FileName>C:\Program Files\Replay Video Capture\RVCap.exe</FileName> 
  <WindowName /> 
  <RunIfOpen>1</RunIfOpen> 
  <ShowStyle>1</ShowStyle> 
  </INS1>
- <INS2>
  <id>4096</id> 
  <DelayInterval>10000</DelayInterval> 
  </INS2>
- <INS3>
  <id>4114</id> 
  <IsAB>1</IsAB> 
  <XABCoord>42802</XABCoord> 
  <XRELCoord>1740</XRELCoord> 
  <XRELLOCCoord>-1177</XRELLOCCoord> 
  <YABCoord>57599</YABCoord> 
  <YRELCoord>10111</YRELCoord> 
  <YRELLOCCoord>3775</YRELLOCCoord> 
  </INS3>
- <INS4>
  <id>4108</id> 
  </INS4>
- <INS5>
  <id>4109</id> 
  </INS5>
  </COMMANDS>
  </MACRO>
  </MACROS>
  <RECORDINGS /> 
  </MACROMAKER>

It is a little bit tricky to use RVC especially in those cases when you need to select a recorded region manually, but it is possible.

Macromaker allows you to schedule execution of your macros.