John
I also noticed this with the Table scroll bar which seems to be a glitch in the table control wizard.
What I found was that if you use the wizard to generate a browing table (file or query based) then this is the effect you will get regardles of the settings on the Details tab.
If you create a memory table and then change it to browsing by adding the file and assigning the colum links then it works as advertised.
I know its a PITA but if you are desparate at least it is a workaround - I'm talking v14 here but I think v12 was the same.

As for your second point, you cannot search or search\replace on only the slected code.
I guess in a way this is reasonable as code you contain distinct varaiables and elements so the 'Window Code' option should be sufficient.
Meanwhile in the real world!!!!!!!!!!!!!!!!!!
HTH
Regards
DerekT