accented chars & dead keys problem

Hi!

In the past I did two books (actually one book in a two parts :-) using LyX
with dead-keys mechanism via xkeycaps modified xmodmap.

Recently I returned back after not so glorius adventure with XML technology
and decided that LyX/LaTeX is still the best route to write :-))

For my writing I use both Croatian & English language with diacritics for 
Sanskrit language which includes: abovedot (dot), underdot, tilde, acute & 
macron accents.

I modifed my xmodmap (with xkeycaps), mapped dead_abovedot, dead_underdot etc.
and use Mode_switch key. 

Under KDE Konsole I can get e.g. a-macron, s-acute chars (those for which there
are glyphs in the console font).

However, in LyX (1.3.4) I can only enter s(S)-acute via dead-key mechanism, i.e.
pressing Mode_switch key + accent + char.

If I write some of the required chars in *.tex file, e.g. \={a}, \.{r} and
import such Tex file into LyX (via relyx) I see the chars on the screen
(although there is no macron accent defined - there is ugly Zcaron instead :-(
and DVI is OK.

So, my question is whether is dead-keys mechanism supposed to work in latest
LyX (qt front-end)?

If not, what is the recommended way to enter (and see them on the screen)
accented chars when using more than one language plus the accented characters
not belonging to the main language (Sanskrit diacritics)?

(e.g. for mixing Croatian & English I choose Croatian as default, and would like
to be able to enter & see Sanskrit diacritics.)

I know that Unicode is the solution, but probably it won't arrive in LyX 
tomorrow :-(

I'm on Gentoo and my locale is:

bash-2.05b$ locale
LANG=en_US
LC_CTYPE=hr_HR.UTF-8
LC_NUMERIC=hr_HR.UTF-8
LC_TIME=hr_HR.UTF-8
LC_COLLATE=POSIX
LC_MONETARY=hr_HR.UTF-8
LC_MESSAGES=en_US
LC_PAPER="en_US"
LC_NAME="en_US"
LC_ADDRESS="en_US"
LC_TELEPHONE="en_US"
LC_MEASUREMENT="en_US"
LC_IDENTIFICATION="en_US"
LC_ALL=


Any hint what to do in order to resolve this dead-keys issue?

Sincerely,
Gour

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