With this feature you can make any updates in CIS modules to prevent bugs, crashs, virus injections, etc., without the need of an full CIS update.
Talking about the dev side: You can provide better solutions to improve quality of CIS and solve bugs without the need of making a full new release. This means less time developing, quicker updates to fix big problems in CIS and a better way of adding new methods of scan for the engines;
Talking about the USER side: The user will not have to wait for a new release to have some bug/crash/etc solved. The user will continue with CIS even if it has some anoyng bug or some dangerous bug just because the devs will provide aquick update for that problems.
When You have full software updates you force users to stay away when the problems comes. And any user who had unninstalled CIS because some bug or some problem with malwares that CIS didnt find in the actual release, they (the users) probaly will not return using CIS just because he thinks that CIS is not secure or he thinks that the COMODO company dont care about his security when it will fix some problem only with new full releases.
hope you understand my words here.. bad, bad, BAD english my own.
Edit.: I didnt know the comodo comunity till days ago but i realy like it. Ive seen many people helping with bug reports, suggestions, etc. Even if this idea is not possible or you, devs, think its not necessary, ill keep with CIS and recommending for others just because I realy like CIS and the way You see the comunity effort. But its a point to consider.