1. Yes, but your code probably wont be distributed. This is mainly so Clickteam can check that it doesnt contain malicious code. It's the same deal when someone sends in an extension to put in the downloads section on CT, they need the source so they can check your not trying to bugger up their systems.
2. No, there is no size limit.
3. Yes you can.
4. Yes, as long as you havent released it publically, or wont be releasing it publically until after the competition has been judged, and the winners announced.
See the competition rules for more information.
"Now I guess we're... 'Path-E-Tech Management'" -Dilbert
Shen: is that you in your avatar? @__@
I should hope not. That avatar is more disturbing than Marilyn Manson.
And the competition page is still down, at least at the time I wrote this. Dammit, ShadowCaster, stop having broken links everywhere .
Disclaimer: Any sarcasm in my posts will not be mentioned as that would ruin the purpose. It is assumed that the reader is intelligent enough to tell the difference between what is sarcasm and what is not.