Im a mac user,
to solve the spinning issue, use the downloadable rs client on their official website, and then you simply edit one line of code to make it load up the oldschool runescape not the new one, a guide to do so can also be found on runescape.com, or google it.
as for a auto-talker, i just use applescript with the following script:
tell application "System Events"
set texttosay to "white: buying lobsters 200 each - <insert username>"
repeat
delay 2
keystroke texttosay
delay 3
keystroke return
keystroke texttosay
delay 3
keystroke return
keystroke texttosay
delay 3
keystroke return
keystroke texttosay
delay 3
keystroke return
keystroke texttosay
delay 3
keystroke return
keystroke texttosay
delay 3
keystroke return
display dialog the "Do you want to quit?" buttons {"Continue", "Quit"} default button 1
if the button returned of the result is "Quit" then
exit repeat
end if
end repeat
end tell
i shortened the script for the sake of this comment not being huge, so copy and paste the body of the script numerous times to make it run for minutes before prompting you to continue or not, the above example would only say it 6 times before stopping.