I know we've discussed this in the past, but we're very behind on the base platform we use to build and target Aptana products. Eclipse is now on Milestone 3 of Eclipse 3.4; and Eclipse 3.3 final has been out since June.
Most of our users who use us as an Eclipse plugin use us on 3.3, and until we target that version there will be a number of incompatibilities. For example, in RadRails we cannot provide evaluation of arbitrary expressions under the debugger because Eclipse moved (rather than deprecated) a set of debug APIs between 3.2 and 3.3.
We'd also be able to take advantage of UI and other improvements in the base platform.
(just a thought... If this issue hasn't been resolved by April, it might be a good idea to go straight to the 3.4M series... 3.4 is due in June.)