I'm not sure of what you are asking but I think you are confusing going from console and changing root's crontab on a system versus going from another server (telnet, ssh....) to a system and changing root's crontab.
The crontab for root is a file (as you specified, /var/spool/cron/crontabs/root). To change the crontab for root, use the crontab -e command (read the man page on crontab first). The system will start some type of editor session - so it's like editing any other file at that point. You make changes, save, and exit the editor.
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if the root cron reach its maximum capacity how the unix will handle the incoming cron job from the console.
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I have never heard of a maximum capacity for cron - I doubt you could reach it since those of us who have mistakenly created incorrect entries in cron which have created multiple processes in seconds can tell you, it won't be the crontab that gets to a maximum but the server - with runaway processes in endless loops. The most entries I have seen in a crontab to date: 171 (a DBA who has so much running in cron, I don't think he even needs to come to work anymore).
