lumar,
According to this link, it should be possible to install the RTC client into MyEclipse 10.0, as MyEclipse 10 is based on the classic package of eclipse 3.7. The article says this:
Note that Eclipse 3.7 (Indigo) is now available. RTC 3.0.1 does not officially support this version but you can find the pieces that must be installed in 3.7 too.
Also, this forum entry indicates that the installation was successful by using the Installation Manager option of installing the RTC client.
If you have problems with installing into release 10.0, release 9.1 is based on eclipse 3.6.1, as Swapna mentioned, which is a version supported by RTC support.