APM 11.5.1 : Webtop customization.

We've done minor modification to the webtop.inc and while the changes we did we needed to make the webtop easier to use, i'm not sure it was worth the hassle.

changing that file means every time you install a hotfix/update to the F5's, you need to replace that file with your customisations, and if F5 update the original file, then you will have to incorporate that with yours (same with the advanced customisation, we had customisations from an earlier code base and when we went to implement a checkbox from 11.5 code to the logon page from 11.2, everything broke pretty badly).

As far as the PHP code goes, i'd try to keep as much of it as possible, there are a lot of tie ins between the APM pages and APM itself that may cause issues if you remove the code.