a) I would like to extend the LED that flashes when I receive a SMS or miss a call. I noticed that after 15 minutes, the flashing led turns off. (I would like the LED to stay flashing until I have acknowledged the event. (I am aware of berrybuzz, but not sure if berrybuzz can accomplish this task).

b) Second, I am interested in changing the keylock. Normally I would like to lock/unlock feature to be activated by a combination of keys rather than just one. If anyone has any advice on this, that would be appreciated.

c) A feature which after a certain amount of inactive on the Blackberry (BB) would automatically activate keylock. (I know there is a second party application which MAY achieve this.

d) Can you use the GPS function without a data plan? I am under the assumption that you can't.

e) Is it possible to customize the alarm sound? I can't seem to find the option.

Welcome to the forums

1) Try taking a look at BerryAlerts

2)You can set a password on the device. This may not be what you're looking for but it is something I always recommend.

3) With a password set, you can set the timeout before it locks. It will autolock when it reaches the timeout.

4) A data plan is needed for most GPS applications.

5) If you go into your alarm application, it should give you an option for Ringtone. You should be able to change it to what you would like.

anyone care to elaborate on a)

and I am familiar with b)... looking for a better option...

There isn't one.

New Program Available - BlackBerry Alerts

Also try searching BBAlerts