At least under ubuntu 10.10, CB 10.05 window to set up arguments to be passed to your compiled projects is unreadable.
Unfortunately, I could not find a way without recompiling. It seems that there is a problem with multilines text controls.
A work around is to modify the select_target.xrc file in /src/sdk/resources, suppressing the folowing line
<style>wxTE_MULTILINE</style>
which is below <object class="wxTextCtrl" name="txtParams">
recompile...
You will then get a single line, visible and usable...
By the way, do not transmit your parameters using options defined with a "-" prefix: they would be interpreted by your terminal as undefined options.. -- works well with xterm.
Hope this may be usefull!